Question

I dont understand, picture below please help

Answer 1

Answer:

$\displaystyle \boxed{3}x + \boxed{7}$

Step-by-step explanation:

$\displaystyle -2[3x - 3] + [12x + 8] → -[6x - 6] + [12x + 8] = 6x + 14 \\ \\ 3x + 7 = \frac{6x + 14}{2}$

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