$\frac{9x^7+27x^6+5x+7}{x+3}$
$\left(9^6\right)\left(9^2\right)^{-3}$
$\left(x-5\right)\left(x+1\right)$
$\left(-4\right)\:x\:2\:x\:\left(-6\right)$
$x^2-7x-78$
$\cos\left(250\right)=\frac{800}{x}$
$\frac{sin^2\left(x\right)-2\sin\left(x\right)+1}{sin\left(x\right)-1}=sin\left(x\right)-1$
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