$-4x^3y\left(6x-8y^2+5x^2y^2\right)$
$-4a-10b+9a-6b$
$\left(3m^2n+2xy\right)^2$
$\frac{x-1}{x-4}=\frac{2}{x-4}$
$i ( 2 + i )$
$\left(+6\right)\:x\:\left(-5\right)$
$\frac{d^2y}{dx^2}=\frac{1}{2x^2}$
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