$28x^4-35x^3+42x^2$
$9m^6-36n^3$
$y\left(y+2\right)\:-\:4y^3$
$\left(2z^7\right)^3\left(z^{-3}\right)$
$5\cdot\left(m-4\right)=2m+3\left(m-1\right)$
$2x+10=800$
$\left(9+a\right)\cdot\left(9-a\right)$
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