$3x^2y^3-\left(-\frac{5}{3}a^2x^2\right)$
$3m;m=5$
$\frac{64}{x^2}-121$
$x^2+2x-12=0$
$81y^2-18xy+x^2$
$12am+54am$
$3\frac{dy}{dx}+2y=30$
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