$2x-10\le12$
$45x^2-81b^2$
$2x^2y^2+x^2+y^2-5,\:x=2,\:y=1$
$\frac{\sin\left(-x\right)}{1-\cos\left(-x\right)}$
$-14-7x$
$3\sec b-6=0$
$\frac{\cos\left(x\right)}{2}=\frac{\sqrt{2}}{4}$
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