$x^2-7x+5\:x$
$-x^2+18x-45$
$52\left(-46\right)$
$\int_0^{\infty}\left(t^2e^{-st}\right)dt$
$\frac{7}{a^2-3a-4}+\frac{2a-5}{a^2-3a-4}$
$\left(3x^3y-y\right)dx=\left(x^3-y^2\right)dy$
$2a^2-200a-150$
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