$\left(4+2x-5x^3\right)\left(2x-1\right)$
$3x+6=x+2$
$\log_x\left(x+4\right)+\log_x\left(x-2\right)$
$\left(3^a-2b\right)^2$
$2^2\left(2+1\right)$
$64-125y^3$
$\left(a-b+n\right)^2$
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