$\left(x^3+6x^2+12x+16\right)-\left(x^3+3x^2+3x-1\right)$
$\left(f-g+n\right)^2$
$2x^2+5x=2$
$6a+12b$
$-2.7\cdot2$
$-8\left(-2r-2\right)-6r$
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