$\lim_{x\to1}\frac{2\ln\left(x\right)}{x-1}$
$345-1+7$
$x^2+4x-1=0$
$140x^5y^4z^2-70x^4y^3z^2+105x^3y^2$
$\frac{d}{dx}\left(7x^2y+3xy^2=0\right)$
$\left(10x+6\right)\left(10y+2\right)\left(10z+1\right)$
$4a^3bx-4bx$
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