$\left(25+56+89\right)+59$
$16a+24b\:$
$14\:-\:\left(8\:+\:7\right)\:-\:\left[4\:+\:2\:-3\:-\:\left(-4\:+5\right)\:\right]$
$2x+3x-4\left(x-2\right)$
$\left(-1\right)^n\left(\frac{\left(n^2x^n\right)}{2^n}\right)$
$\frac{\left(30y-12x^2y+9y\right)}{3x}$
$9\left(x^2-14x\right)$
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