$3\left(a+2b\right)-\left(b+2a\right)$
$\left(3b^6\right)^6$
$\left(x^2y^4-3z^5\right)\left(x^2y+3z^5\right)$
$\frac{12x+7}{x^2-x-2}$
$\left(6x^2\:-2x+5\right)-\left(2x^2-7x-11\right)$
$\left(+85\right)\:x\:\left(+45\right)$
$\left(m-y\right)^2$
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