$16x^2-121$
$\left(\frac{2}{9}m^3c^4-\frac{3}{8}b^2f^5\right)\left(\frac{3}{8}b^2f^5+\frac{2}{9}m^3c^4\right)$
$5y\left(4x+2\right)$
$\frac{1}{3}\left(x+23\right)=\frac{5}{3}x+\left(x-4\right)^2$
$-2\sqrt{10}-7\sqrt{10}$
$1170\cdot6$
$m2+6m+9$
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