$\frac{7xy^4z^3}{z^3}$
$\frac{\left(x^3+2x^2\right)}{3x^2-1}$
$10a-15b-20c-30d$
$\frac{x^4}{\left(7+x^3\right)^2}$
$\csc\left(x\right)-\tan\left(x\right)\cos\left(x\right)=\cos\left(x\right)\cot\left(x\right)$
$3,\frac{54}{2},5$
$x^2+12x-8=0$
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