$x^2y-xy-8\:=\:-4$
$\left(3x+94\right)+\left(x+18\right)+\left(2x-4\right)$
$-6\left(12\:-\:15\right)\:+\:23\:=\:$
$\left(-7x+6\right)\left(7x+6\right)$
$\left(5\tan10+10\cot80\right)\tan80$
$x-63=17$
$\lim_{x\to\infty}\left(\frac{\left(7sinx-7x\right)}{x^3}\right)$
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