$\left(3z^3\cdot z\cdot2\right)^2$
$\lim_{x\to2}\left(x^2+2x-7\right)$
$x^2.x^4.=x^6$
$\left(xa\:+3b\right)^2$
$x^2y^2-3xy^2$
$6\left(4p+3\right)$
$4m^4-49n^2$
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