$9-4x>6-3x$
$sin\left(\frac{\pi\:\:}{2}-\theta\:\right)=cos\theta\:$
$\left(7-c\right)\left(7+c\right)$
$\frac{1}{2}x^{2}-x-\frac{3}{2}=0$
$\frac{x-2}{x+3}=2$
$\left(4ab2\right)\left(6xy3\right)$
$-12u+7+12u$
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