$\frac{d}{dx}5x^2+3y^3+\frac{2y}{xy-8}-7$
$\int\left(4-x\right)^3dx$
$4^2-7-\left(-7\right)^2$
$6x+\:\left(x\:+2z\right)-\left(x+z\right)$
$w^2+10w+10$
$\frac{x^3-x+1}{x+1}$
$8x+5=7x-4$
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