How much greater is the value of 3x + 5 than the value of 3x − 7?  Options:	A) 8	B) 10	C) 12	D) 14	E) 16
Explanation: The easiest way to do this is to pick a number for x. Let’s say x = 3.   3(3) + 5   = 9 + 5= 
<gadget id="calculator">9 + 5</gadget>
<output>14</output>
14   3(3) − 7= 9 − 7   = 2   The correct answer is 14 − 2 = 12.   Answer : (12)
<result>C</result>
How much greater is the value of 3x + 5 than the value of 3x − 7?