$6^4.\:2^3$
$64x^2-16$
$25\cdot\frac{1}{5}$
$15\cdot3\cdot12\cdot\left(-5\right)$
$\left(2.72\right)\left(6.04\right)$
$\frac{-x+3}{x^2-9x+20}$
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