$\frac{54}{-9}$
$70x^2+12x+16$
$4x^2-x^2-6x-9-2x^2-x-3$
$\sqrt{x-15}=0$
$\sqrt{4\cdot16}$
$\frac{\left(1-cos2x\right)}{x^2}$
$\left(5n^6+12\right)\left(5n^6-30\right)$
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