$82-\left(3\cdot7\right)+70$
$a+b+2b-2c+3a+2c-3b$
$\left(3x+5y\right)^2\left(3x-5y\right)^2$
$x+y=-x-2$
$\lim_{x\to1}\left(\frac{x^7-1}{x^8-1}\right)$
$\int\:\frac{\left(u+3\right)^2}{u}du$
$\int_0^{\frac{3}{2}}\frac{1}{\left(x+2\right)\left(x-2\right)}dx$
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