$\left(3x-1\right)\left(9x^2+3x+1\right)+\left(3x+1\right)\left(9x^2-3x+1\right)$
$3\left(y+3\right)-4\left(2y-7\right)=-5y+2$
$y'=\frac{x^4+y^4}{xy^3}$
$\frac{dy}{dx}=5x+3$
$2.7307^2$
$x^6-12^3y^2+36y^4$
$17\:-\:\left\{5\:-\:3\:+\:\left[8\:-\:\left(-1\:-3\right)\:+\:5\right]\right\}$
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