$2x-2-\frac{4}{x}=0$
$7x-8+10x-3x+4$
$x\left(x-5\right)^3$
$21x^2\left(7x^8\right)$
$k^8y^{12}-1$
$-2x^2+4=-2x$
$\frac{d}{dx}\:x^{2x+1}$
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