$7q+6q-12q=14$
$\:-6\left(5d+5\right)+5\left(2d+9\right)$
$4m^2n+30m^2+2m^2$
$\frac{dy}{dx}=\frac{2}{3x+1}$
$sin2x\:-\:2cosx^2\:=\:0$
$a^6b^6-b^6a^2$
$\frac{x^2+2xh+h^2-x^2}{h}$
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