$40-2x\cdot40-2x\cdot40-2x$
$f\left(x\right)=\frac{\left(x-8\right)\left(x+20\right)}{\left(x+2\right)\left(x-3\right)}$
$\left(m+1\right)\left(n-1\right)$
$21+x<25$
$\left(+55\right)\:-\:\left(-97\right)\:$
$-5y+2-8y+10$
$2x+\frac{3}{4}x+\frac{1}{4}x+x-\frac{5}{6}x$
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