$5x-9<4x-5$
$\frac{\left(21x^2+15x\right)}{\left(-3x\right)}$
$4sinx\:+\:2x^4-x^{-\frac{1}{2}}$
$\frac{15}{\left(w^4-2w^2\right)+i\left(5w^3+8w\right)}$
$2x^3+x^2-2x\:$
$3h+6h-9h$
$\frac{d}{dx}20$
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