$\frac{1}{1+y^2}dy=\frac{-1}{1+x^2}dx$
$15+a>7$
$\:y'\:+\:y^2\:-\:y\:=\:0$
$-3.6-1.9t+1.7+5.1t$
$\sqrt{12}:2\sqrt{3}$
$a+9=\frac{18}{a}+2$
$5-2\left(4-x\right)\le3x-8\left(3-x\right)$
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