# ( 6 s <mrow class="MJX-TeXAtom-ORD"> 2 </mrow> </msup> + 6 s +

$\left(6{s}^{2}+6s+7\right)﻿+\left(7s-3{s}^{2}\right)=$?
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Remove parentheses.

$6{s}^{2}+6s+7+7s-3{s}^{2}$

Subtract $3{s}^{2}$ from $6{s}^{2}$.

$3{s}^{2}+6s+7+7s$

Add $6s$ and $7s$.

$3{s}^{2}+13s+7$

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