$x+13y-20y+14x$
$\left(2x+6y\right)^{2}$
$17\cdot7$
$\left(6x-y+3z\right)^2$
$8\left(s-8\right)=8$
$\:\left(x-y^2\right)dx+\left(-2xy-y\right)dy=0$
$3\frac{dy}{dx}+2y=10$
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