$-2-\left(-38\right)$
$+2-1-6-4$
$2^2-x-6$
$\left(4x\:+\:6y\right)\left(4x\:-\:6y\right)$
$\frac{2x+11}{\left(x+2\right)\left(x-1\right)}$
$2x+\left(f+x\right)$
$\frac{2x+2}{x^2-4}\cdot\frac{x^2-2}{x+1}$
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