$x\left(x+y\right)=5x+3$
$\:3\left(n\:-\:1\right)\:-\:7\left(n\:-\:1\right)$
$5x^2-15x+10$
$\frac{dy}{dx}x^2+4x=xy^2$
$3x+10=-14$
$\frac{-x^4-2x^4+3}{x+2}$
$\frac{a}{6}+13=20$
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