$\left(10a^2+7b^2\right)\left(5a^2-3b^2\right)$
$1\left(-1\right)-\left(-2\left(-1+\right)\right)\left(-4\right)$
$\left(7+y\right)^3$
$2-8v^2$
$\frac{8+x^2}{2-x}$
$5x^2+15x+1=0$
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