$\frac{2y}{1+y^2}y'=\frac{1}{x}\:when\:y\left(2\right)=3$
$\int2^{7x+4}dx$
$-x\le-7$
$81+36p+4p^2$
$-2x\:-\:6\:+\:9y\:-\:3x\:-\:9y\:$
$-13=x+3$
$49a^2b^2-9c^2$
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