$3^{-2}\cdot3^{-4}\cdot3^4$
$-4y^2+11y^2+7y-2y$
$\frac{2}{3x}\le-2$
$\lim_{x\to0}\sqrt{15+\cos^2\left(x\right)}$
$6a+2b+24c$
$\left(a-b+7\right)^2$
$\sqrt{-3.\:\left(-8\right)+\left(-5\right)^2}$
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