$-2x^4+5x^4$
$a^2\left(2a^2-3a-c\right)+\left(\frac{a}{2}+a^2-c\right)$
$\left(2x+7\right)\left(x-1=0\right)$
$\left(35-3x\right)^2$
$-6+\left(+5-9-2-3+4\right)-7-\left(-9+2+4+1\right)$
$\frac{5}{c^{-7}d^4}$
$-320y+40y+-20y$
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