$5a-b-2a+b^2$
$\frac{x}{3}+10=15$
$4.5-1.5+0.2-0.25+2$
$10\:x\:10^9$
$\left(6+7x\right)^{\frac{2}{x}},\:x=1$
$\left(x-3\right)\left(x-1\right)\cdot\frac{2x-3}{x-3}-\frac{x-2}{x-1}$
$\int\:\left(1+x\right)sen\left(1-x\right)dx$
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