$\int\frac{x^3}{\sqrt{x^2}+100}dx$
$8a^2+21ab-20a$
$2\cdot1+\left(-1\right)\cdot\left(-3\right)$
$90.326-14.272$
$16-5x\ge3x$
$5x\:+\:\left(\:x\:-\:7y\right)\:-\:\left(8x\:-\:7y\right)\:-\:x$
$\frac{y}{8}=\frac{5}{8}$
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