$9x^2-30x+25$
$\frac{5}{4}x+6-2x$
$-4\left(-\frac{1}{10}\right)\left(240\right)$
$-2x-99x+1$
$-x+4,1\le0$
$\left(2x^2y-y^3\right)^3$
$\left(-7\right)\:-\:\left(-4\right)$
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