$8x+39=2x-15$
$\left(2x+3\right)\left(2x-3\right)=135$
$x^4-10x^4\:+25$
$9^5\cdot9^7$
$\frac{\left(\sqrt{x^2}-49\right)}{7x}$
$9n^6-18n^3+n^3$
$\frac{d}{dx}\sqrt[3]{x^2}+x$
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