$\left(s+20\right)\left(s-30\right)$
$125m^3+64$
$-6\cdot\left(-18\right)$
$-3x^2+2x\le-2$
$\int\frac{11}{8x\left(x+1\right)^2}dx$
$9ab^{3\:}+6ab^{3\:}-\:2ab^3$
$\frac{x}{2}+6=4$
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