$\sqrt{x+4}+5=12$
$\lim_{x\to2.1}\:\left(x^2-3x+1\right)$
$\left(a+b\right)\frac{n}{n}$
$55\:\cdot\:\left(-11\right)$
$\frac{x}{2}-5=35$
$\left(5m-6n\right)^2$
$\int\frac{-x+3}{x^3-2x^2+3x}dx$
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