$\frac{2-3x}{5}+\frac{4x-2}{3}$
$-\frac{28z^9}{14z^7}$
$x^{10}+3x$
$\frac{6-x\cdot13-x}{2}$
$2m\:-3n\:-\:-2m\:+n-\:\left(m-n\right)\:$
$\left(2a^x-1\right)\left(a^x-5\right)$
$-\frac{11}{14}.\left(-\frac{1}{17}\right)$
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