$6xn+9xm-12xf$
$\lim_{x\to0}\frac{\cot\left(3x\right)}{\cot\left(2x\right)}$
$-r+6+8r-14$
$4y^2\cdot y^2$
$7a^3\left(1-2a+5a^2\right)$
$x^3+3x^2+3x+1$
$6x-3=4x+7$
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