$-30-\left(-2\right)$
$\left(5x^2-\:5y^2\right)^2$
$5x^2y^2-15xy+20xyz$
$\left(3x+4\right)\left(5x-2\right)=0$
$2yx^3\left(xy^{-4}\right)$
$\:4^3+3u^2+1$
$-7\cdot\infty$
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