$6^2-51+2+-12^2-8+22$
$3x-4=x+6$
$20-15+15-10-7+1+12$
$\left(\frac{a^5}{243}\right)\left(\frac{3}{b}\right)$
$-81\:r\:\:-13r\:-45$
$\lim\:_{x\to\:\:\:0}\left(\frac{\sqrt{sin\left(x\right)+4}-2}{x}-\frac{sin\left(x\right)}{4x}\right)$
$\frac{c}{4}+2=5$
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