$\frac{x}{18}=21$
$2+x+10$
$3a\left(3\right)-a^2$
$\lim_{x\to0}\left(\frac{x^3+x^2-24x+36}{x^2-2x-3}\right)$
$5x+12=4x+6$
$\frac{\sqrt{3x+2y}-\sqrt{2x}}{3y}$
$\cot\left(x\right)\sin\left(x\right)+\cos\left(x\right)=2cos\left(x\right)$
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