$\frac{x-y}{x}\frac{dy}{dx}=\frac{x+y}{x}$
$\left[-2\right]^2x^3\left[-x\right]^3$
$\frac{2}{x-6}+\frac{7}{x+2}=\frac{2x+4}{x^2-4x-12}$
$\left(b\cdot\sin\left(x\right)\right)^2+\left(a-\left(b\cdot\cos\left(x\right)\right)^2\right)$
$4\cdot100-21+\sqrt{x=13\cdot30}$
$\left(\frac{1}{4}x+\frac{1}{3}\right)^3$
$\sqrt{49}-\:7$
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