$6\sqrt{98a^2b}-9\sqrt{72a^2b}+\sqrt{200a^2}$
$y^2>49$
$20-2x=-3x+6$
$\lim_{x\to\infty}\left(\frac{4x^3-2x+1}{7x-6}\right)$
$9-\left(-8\right)-\left(-19\right)$
$\left(3x-12y\right)\left(3x+12y\right)$
$-10k+22=2$
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