$5\sqrt{9}$
$12:-8$
$-28-\left(-13\right)$
$\:\:\left(-\frac{1}{2}xy^2+3z^4\right)\left(3z^4+\frac{1}{2}xy^2\right)$
$2b+2=3+b$
$\left(5x^2-3\right)\left(5x^2+9\right)$
$\left(4c^2\cdot c\right)^2$
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