$\frac{x^2}{1+8^3}$
$5x^3\cdot\:2x^4$
$\left(x+2y\right)+3z=x+\left(2y+3z\right)$
$4n+6+n-2$
$\left(5z+2y\right)^3$
$\left(3x\:+\:\frac{1}{4}\right)\left(3x\:+\:\frac{1}{4\:}\right)$
$\int\frac{-1+x^2}{1+2x+x^2}dx$
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