Question: I have really no idea how to do this . I have come to $x = 3\pi (\sin^2(x/2))$ . How can I solve this? In such type of problems how can I take help of the graph(wolfram alpha equation solver used graph)? Will I have to plot $2x$ & then the R.H.S ? Plz teach me the technique so that I can easily use graph in such problems.

Answer: 
I figure that I should answer my own question, as I am not fond of the other answers and long ago settled this in my head.

Subtraction and division do not exist. There are only addition and multiplication. (Subtraction is addition of negative numbers, division by $x$ is multiplication by $1/x$.)

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> So BODMAS should be BOMA.
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For example, if subtraction "existed" then it would be associative, so $$-4=(1-2)-3=1-2-3=1-(2-3)=2.$$
This is clearly wrong, so subtraction cannot exist. Rather, $1-2-3$ is shorthand for $1+(-2)+(-3)$ (this is what egreg says in the comments) - it is short hand for addition of negative numbers.

Note that BODMSA would not differentiate from either of the above "answers".

I am uncomfortable with saying "we read left to right", as addition and multiplication of read numbers is commutative. Stipulating an order looses this strong feature!
It must be BODMSA at all times. BODMAS is fake. Don't try to defend it and reject the impeccable BODMSA on the grounds of pronunciation. Can the 'nice' pronunciation right the wrong?  

Someone suggests we teach our students to consider, for example: 12-5+4 as 12+(-5)+4 without regarding the minus sign. I ask my fellow teacher, "what about 12-(-5)+4? Is the minus sign still insignificant?
In fact, we must admit to give priority to subtraction over addition in the order since it is correct at all times, whether it be at the left or the right. 
BODMAS says 12-9÷3+5=4; also 12-(-5)+4=13 while BODMSA gives correct answers of 14 and 21 respectively. 
It's true doing the operations from left to right is correct doesn't mean we should embrace what is not true.