$3x+2y+15z+8x-4y-10z$
$x2+19x+18$
$\log_{10}\left(x\right)=-8$
$\int\frac{1}{1+2x+x^2}dx$
$\frac{2}{3}x^2y.\left(\frac{1}{2}xy+x^2y^2-3xy^2\right)$
$20x^3-6x-18x^3-8x^2$
$\frac{dy}{dx}=\frac{e^{-y}+e^{-2x-y}}{e^x\cdot y}$
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