$\lim_{x\to\infty}\:\frac{\left(x^2+x-12\right)}{x^2-9}$
$14-12x=86$
$\int\left(3y+y^2\right)\sin\left(2y\right)dy$
$3\left(y+3\right)-4\left(2y-7\right)=-5y+2$
$x^2-3x=8$
$10x^2-20x-93=0$
$\frac{dy}{dx}=\frac{x^4}{y^5}$
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