$64z^2-112z+49$
$9x^2+3x^2+2^2$
$8\:-\:12\:-\left(6\:+\:4\right)$
$\left(-1\right)\left(-3\right)\left(-4\right)$
$\left(3\cdot10^3\right)\left(7\cdot10^6\right)$
$\sqrt{9a^6b^8}$
$5w\left(4w^2-2w\right)+3w\left(-2w^2+4w\right)$
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