$\frac{m^4-81}{m^2-9}$
$10-\left(-8-7\right)+\left(-9+3\right)$
$7b-15\:\:\:5b-3$
$6xy^2-xy^2+7xy^2-8w-3xy^2$
$14b+\left(21b-10b\right)$
$3b+3a+2c^2+2c^2+c^2+c$
$\left(x\right)\left(x-1\right)\left(x-5\right)$
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