$\left(a+b-2c\right)\left(a-b+2c\right)$
$82c^2-16y^2$
$3x-2=2x^2$
$\lim_{x\to\infty}\left(\frac{\sqrt{x}}{5\sqrt{x+1}}\right)$
$\frac{y}{2}+7+4+4+7$
$x+\left(-18\right)=5$
$\left(15x-7\right)\left(15x+7\right)$
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