$\left(3x\right)-6\le-30$
$-5x-9=-54$
$\frac{tan^2x-sin^2x}{1-cos^2x}=tan^2x$
$r^{2}-9r$
$\frac{38}{2}$
$\frac{5x^2-x-160}{x^2-25}$
$-\frac{112}{x}=7$
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