$-13v=195$
$1x+1x+1x+1x$
$\frac{d}{dx}11x-x^2y^3=-4y$
$2+4\cdot3^2$
$\left(4c^2\:+\:2d\right)\:\left(4c^2\:-\:d\right)$
$\left(2x-1\right)\left(x+2.5\right)$
$9x^2\:\:-\:36xy\:+\:36y^2$
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