$4\:y\:-\:9\:b\:+\:7\:b\:-\:12\:y$
$x^2-2x\le3$
$1-cot^2x-csc^2x$
$-4\sqrt{27}\cdot8\sqrt{12}$
$\frac{2x^2y^{-2}}{2y}$
$2x-3y+x-10y-b$
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