$\left(9x+1\right)\left(9x-1\right)$
$1+4\left(6z-9\right)$
$3a-5b+4c+3a+7b+c$
$16v^2-24v+9$
$1-3\left(2x-2\right)+2x=9-5x$
$\int_0^{2x}yxdx$
$x^2+3x^2+7xy^2-y^2$
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