$\log\left(x^2-5x-24\right)-\log\left(x^2-64\right)$
$81\left(2x\:-3\right)^2\:-90\left(2x\:-3\right)\left(4x\:-1\right)+25\left(4x-1\right)^2$
$28\cdot125$
$2\cdot56x$
$\frac{-81}{+27}-18+3$
$4x^2-10x+25$
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