$x^2+7x>0$
$36x^2-25y^2$
$\frac{28^3y^2z^5}{7yx2}$
$-8\left|5\right|$
$\frac{x^3+2x^2+4x+2}{x^2-0}$
$\frac{2x^2-10x-16}{x-6}$
$3\left(1-\sin x\right)=2\cos^2x$
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