$31-24-12+45-23+1$
$2x-9y-4x+6y$
$\left(\frac{1}{b}\right)^2$
$\frac{dy}{dx}-4y\left(x\right)+8=0$
$\frac{-h^2-3h}{h}$
$7,\:\frac{1}{8}\:-2,\:\frac{1}{8}$
$\left(cos^2\left(3y\right)+sin^2\left(3y\right)=y+15\right)$
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