$\left|-21-900\right|$
$\left(5xy^2+2x^2\:y\right)\left(2+3x^3-5x^2\:y-xy^2+y^3\right)$
$\lim_{x\to5}\frac{4x-10}{4x-20}$
$-3^2-2^3-1^2-\left(-3\right)^3-\left(-2\right)^2-\left(-1\right)^3$
$4x^2+2x-20$
$3b^3+2b^3+b^3$
$2\log_a\left(x\right)-3\log_a\left(2x\right)+\log_a\left(x^2\right)$
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