$x^2-8x=9$
$\int\:\frac{9\cos\left(x\right)}{9\cos\left(x\right)}dx$
$f+3+4-5f$
$\left(\frac{21}{32}\right)-\left(\frac{1}{q}\right)^2$
$3\left(\sqrt{2}x\right)\left(-\sqrt{2}\right)^2$
$9x^2y^2-25$
$3\left(3x-2x^2\right)^2\left(3-4x\right)$
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