$8^4\cdot8^{-2}$
$-2\left(4x-2\right)+8x$
$x+y=49$
$\left(tf-4\right)\left(tf-19\right)$
$4-\frac{9w}{2}\ge16$
$n\left(n+1\right)=72$
$log\left(4x-15\right)=log\left(2x-9\right)$
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