$x+1=-2x+1$
$cot^2\left(x\right)=\frac{9}{4}$
$\lim_{x\to-\infty}\left(\frac{x^2+\cos\left(x\right)}{e^{1-x}}\right)$
$y'=3x^2y=x^2$
$x^{2\:}+\:7x=-7$
$\left(-54\right)\cdot\left(+6\right)$
$3y^3-y-5-6y+5+6y^3$
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