$\left(a+2\right)^2-\left(a-1\right)^2$
$x^2+8x-180$
$4x^2-16x+12$
$tan\left(e\right)cos\left(e\right)=sin\left(e\right)$
$\frac{3-19x}{2x-12}\le\:2$
$7^{8-4}$
$x^2+13x=-40$
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