$\frac{3x^2+x-7}{x}$
$ambnc-amb^2n$
$\frac{x^3+x+1}{x^2}$
$\left(x-5\right)^2+10\left(x-3\right)-x^2$
$8x+16=8$
$\left(3x+2y-5z\right)\:+\:\left(2x+3y-10z\right)$
$\sec x-\tan x\cdot\csc x+1=\cot x$
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