$2x^2=-x^2+9$
$49a^2-16x^4$
$\frac{sec^4x}{cot^2xcsc^5x}$
$4y^2+24y^2+36$
$\sin2c-2\sin c=\cos c-1$
$\frac{x^2+2x-32}{x+7}$
$\frac{x}{x-6}>1$
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