$-4+\left(-3\right)-\left(-1\right)$
$-3\left(7x-6\right)$
$\lim_{x\to\infty}\left(\frac{1+\:cos\left(x\right)}{sin\left(2x\right)}\right)$
$\lim_{x\to2}\left(\frac{ax+b-4-a}{x-2}\right)$
$x=12-y$
$\lim_{x\to0}\left(\frac{x^2+2x-1}{x^2-1}\right)$
$\frac{d^5}{dx^5}x^4$
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