$20+90+51^2w$
$-2\left(7x+4\right)$
$12x^2b^3\left(x+1\right)+4ab^2\left(x+1\right)$
$2y^3-7x^2=5$
$625x^2-7300x+2550$
$\sin\left(4x\right)+\sin\left(2x\right)=\sin\left(x\right)$
$\frac{dy}{dx}=1.321-0.01y$
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