$\frac{a^{-3}y^4}{x^{-3}}$
$-3y^2+2x+2+3x$
$0.02\cdot x^3-0.4\cdot x^2+10x+1000;\:x=100$
$\left|-4\right|+7-\left|3\right|$
$\frac{5m}{\csc\left(30\right)}$
$6b-9b+8-4$
$9b^2-100m^2$
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