$x+15<21$
$\frac{3}{x^3+x-2}$
$-y+57=x^2-14x$
$\left(-5^4\right)\left(-2^4\right)$
$\int\left(x\left(2x+5\right)\right)dx$
$\left(-\frac{1}{0}-\left(-\frac{1}{-\infty}\right)\right)$
$x\ge6-x$
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