$2k+\:5k+30=\:100$
$\left(14\:x+y\right)\left(14\:x-y\right)$
$7x-x$
$\int4x^2ln\:x^3dx$
$\lim_{x\to0}\left(\frac{x^2\cdot e^x}{1-e^x}\right)$
$\frac{x^2-x+1}{\left(x^2+4\right)\left(x+4\right)}$
$\frac{dy}{dx}=6x^5+7$
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