$-2x-72x^{2}+30x-20$
$x ^ { \frac { 1 } { 3 } } ( x ^ { 2 } + 3 )$
$x^2-x-6<0$
$\left(6m+2n\right)^2$
$3a-7b-2a+5b$
$y'-4xy^2=0$
$\cos\left(\frac{5}{4}x\right)$
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