$b+7=15$
$\left(-4\right)\:x\:2\:x\:\left(-6\right)$
$4\left(x+2\right)-3\left(x-5\right)v$
$\lim_{x\to\infty}\left(\frac{x}{x-1}-\frac{1}{inx}\right)$
$\frac{d}{dx}\left(x^3y^4=x^3-y^3\right)$
$\frac{8m^3-n^3}{m-n}$
$450\cdot40$
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