$9x^4-15x^3-3x^2$
$7^4\times\:5^3\times\:5$
$\left(n-m\right)^4$
$y^2=8\left(x-5\right)$
$2a-a\left(2-a\right)$
$x^2+4xy+4xy^2$
$\left(m-a\right)^2$
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