$2x+y=13$
$\left(-\:12\:+\:20\right)\::\:\left(-\:4\right)\:$
$\frac{3dy}{dx}=\sin\left(4x+2\right)$
$-3x-12$
$\left(-15a^nb^3\right)\cdot\frac{4}{5}ab$
$x2\left(x^3+7\right)$
$50x^2-254x+300$
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