$\frac{x\le-\frac{9}{2}\left(3x-\frac{5}{2}\right)-3}{\frac{1}{3}}$
$y^2-x^2=cx$
$k^2+11k^2+30$
$\left(6a-\frac{7}{4}b\right)^2$
$x^2y-xy^2$
$-7x-10x-8+7$
$log20=log100$
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