$3x+8=-x-24$
$113\cdot17$
$\lim_{x\to4}\:\frac{x-4}{2-\sqrt{8-x}}$
$49y^2-21y-7$
$\frac{d}{dx}\left(9^{12x}+2x^9-e^{9x}\right)$
$-2ab-3ab+8ab-8ab$
$( x ^ { 2 } + 5 ) ^ { 4 }$
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