$\frac{4x^2-1}{2x+1}$
$\left(8x-3\right)\:\left(8x-1\right)$
$\frac{d}{dx}x^4+y^4=21-x^2\cdot y^2$
$\frac{8x-16}{24x-32}=0$
$\sin\left(x\right)=2x+y$
$\int\:100e^{-0.01x}dx$
$12x^2+x\:^3+47x+60$
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