Question
Simplify: $12 x^2-\left(7 x-\overline{3 x^2+15}\right)$
✓
Answer
$12 x^2-\left(7 x-\overline{3 x^2+15}\right)$
$=12 x^2-\left(7 x-3 x^2-15\right)$
$=12 x^2-7 x+3 x^2+15$
$=12 x^2+3 x^2-7 x+15$
$=15 x^2-7 x+15$
$=12 x^2-\left(7 x-3 x^2-15\right)$
$=12 x^2-7 x+3 x^2+15$
$=12 x^2+3 x^2-7 x+15$
$=15 x^2-7 x+15$
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