$f\left(x\right)=\sqrt{\frac{x+7}{x-7}}$
$7b-15\le\:\:\:5b-3$
$\sqrt{11^3-\left(-6\right)^4+17^2}$
$5\left(3s\right)$
$\frac{\cos\left(90+x\right)}{\sin\left(-x\right)}-\frac{\tan\left(-x-180\right)}{\tan\left(360+x\right)}$
$5-5a^6$
$-3\cdot5\:\frac{1}{3}-12$
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