3. Let $m(a)$ and $M(a)$ be the minimum and maximum values of the function $f(x)=x^{2}+2 a x+ a+3$ on the interval $[-2; -1]$. Solve the equation $m(a)+M(a)=4 \frac{3}{4}$.
Answer: $1.5 \| 3 / 2$

Allowed for input are digits, minus, and division sign, a dot or comma as a decimal separator, a semicolon

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