$2-8\sin=6$
$\frac{x^2+7x+12}{2x+2}$
$\frac{x^2-4}{-3-\sqrt{x+7}}$
$5x^2-7x-90=0$
$4ab+2a^2+a^2-4ab+4b^2-a^2-4b^2$
$\left(-15\right)\cdot\left(-23\right)$
$\:6^2$
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