$\frac{4x^4}{81}-100$
$\left(20-2.5x\right)^2$
$9m^2+6g-9$
$\left(-5.697\right)\:-\:\left(-7.286\right)$
$\frac{\left(7+2ln\left(x\right)\right)}{x}$
$\left(2x+7.5\right)\left(2x-1\right)\left(160x\right)$
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