$-x^2-5x+7=0$
$\left(a^{x+1}-6\right)\left(a^{x+1}-4\right)$
$\frac{d}{dx}ln\sqrt{cos\:2x}$
$\left(ab-8\right)\left(ab-7\right)$
$\left(10x^2+y^2\right)^2$
$-\left(5+6-20-3\right)$
$4\cdot12\cdot2$
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