$b+b+2a$
$\frac{1}{2\sqrt{x+1}}$
$3.14+-2.75+-5.29+1.35$
$4ab\left(7a^2-2ab+b^2\right)$
$54:\left(\left(-7\right)+\left(-2\right)\right)$
$\int\frac{2x+1}{\left(x^2+x+1\right)}dx$
$\frac{x^2-4x-12}{x+3}=\frac{9}{x+3}$
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