$b^2-81$
$\left(\frac{1}{2}x^3-8\right)^2$
$4+20b+25b^2$
$\left(2a+3\right)\left(2b+z+4y\right)$
$\int\frac{6+u}{u}\:du$
$4x^2-20x+10$
$\frac{4}{5}x+\frac{6}{5}x+\frac{1}{5}x$
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