$\frac{dy}{dx}=3^{x-y}$
$f\left(x\right)=\left(x+\left(x+1\right)\right)$
$x-\frac{2}{3}y-\frac{2}{3}z=-2$
$x^2=72$
$cos2x+1=-3sinx$
$10^8\cdot10^{-13}$
$\left(9x+7a\right)\left(9x-7a\right)$
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