$100b^2-81c^2$
$\frac{3}{2+4x}$
$\left\{3-\left(-7\right)\right\}+\left\{15+\left(-11\right)\right\}+7+\left\{\left(5\right)-\left(-9\right)-2\right\}-3+\left(-2\right)$
$-x^2+9x+10$
$\left(xy-z^2\right)\left(xy+z^2\right)$
$16x^2-40x+20$
$\left(2a-6b\right)^3$
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