$\log\left(x\right)^2=log\:\left(x\right)^4$
$u\:2\:-\:4u\:-\:60$
$4+3\left(-5+7\right)$
$bmbn$
$\frac{\left(3x^2-7x^2+6x+8\right)}{x-1}$
$x^2-28x+115$
$\left|-15-6\right|$
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