$4x^2-x-6=0$
$-10\left(1-7k\right)-\left(9k=2x\right)$
$\frac{dy}{dx}=\frac{\left(1+y^2\right)}{\left(1+x^2+y^2+x^2y^2\right)}$
$\left(3m\:-\:2n\right)\left(5m\:+n\right)$
$\left(7x-6\right)^4$
$-6\left(-8\right)\left(-2\right)$
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