$\int\frac{x+5}{\left(x+3\right)\left(x+1\right)}dx$
$\frac{7x^2}{\left(100+x^2\right)^2}$
$2-3x\le20$
$x\left(1+y\right)dx+x^3\left(1-y\right)dy=0$
$\left(x^7+1\right)^5$
$y2+13y-30$
$9x^2-18x+36$
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