$-15-3-\left(-20\right)$
$2xy'-y=x^3-x$
$3\left(5x-1\right)+7$
$\frac{4x^3y^2}{7x}$
$\left(-5x^{4}y\right)^{2}$
$-2sin^2x=sinx-1$
$2x\left(2x+2\right)=264$
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