$u-u^2$
$4\left(x+8\right)-4=34-2x$
$\left(5x^4+2x^3\right)\left(3x^4\right)$
$\frac{d^2}{dx^2}\frac{\left(x+1\right)^2}{\left(x-1\right)}$
$\frac{dy}{dx}=\frac{3\left(-2s+st\right)}{s^2-1}$
$xydy+\left(1+x^2\right)dx=0$
$7.4z-5\left(-1.6z-2.4\right)$
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