$3x=15-2x$
$\left(a-6.5\right)\left(a-8.5\right)$
$y'=20-6y$
$2x-4\le0$
$\left(ln\:\frac{1}{x}\right)^{\:^{e^{-x}}}$
$7x\:-1\:\le\:10x\:-\:4$
$2\cos\left(3\theta\:\right)=-1$
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