$3\cdot1\cdot2$
$\frac{5}{2}x+8;x=-3$
$\left(-m^{-2}-n\right)\left(-m^{-2}+n\right)$
$\left(10m^3n^4-9\right)\left(2m^3n^4+3\right)$
$2x-7x+x-8x$
$10-b=21$
$x^6-1:x^2-1$
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