$x^2\cdot\frac{dy}{dx}+7yx=x^3\cdot ln\left(x\right)+2$
$\frac { - t ^ { 3 } + 3 t ^ { 2 } - 9 t } { 4 }$
$\int\:\sin\left(\sqrt{x-1}\right)\:dx$
$\frac{1}{x^{-7}}$
$7\cos\left(x+7\right)-2=4$
$\left(x-y\right)\left(x^3+y^2\right)\left(x+y\right)$
$3z+2z+z-5z$
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