$20+107+116+99+45$
$\left(3+4a\right)\left(4+a\right)$
$6x^5y^2=4x$
$\lim_{x\to2}\frac{5-x}{x-2}$
$2x:x^2$
$2x^2-x-21=0$
$sinx=0.7$
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