$a^2b-a^2b-3a^2b$
$y-5=3y-5$
$\lim_{x\to\infty}\left(\frac{x\:+\:ln\:x}{x+\:ln\:x}\right)$
$x^4-x^2-6$
$\frac{d}{dx}-e^{-x}x^2-2e^{-x}x-2e^{-x}$
$-4x\:+\:8y\:+\:2x\:-\:3y$
$\left(x\right)^3+2\left(x\right)\left(7\right)+\left(7\right)^2$
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