$5x^2-4x+7x^2-6x^2$
$x^2-30x+225=441$
$5\:.\:\left(-7\right)$
$\frac{\sin\left(a\right)}{1-\cos\left(a\right)}$
$6x-2y\frac{dy}{dx}=0$
$\frac{216-a^3}{6+a}$
$\left(-2a-b\right)^3$
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