$5x-12+55-4x$
$-9\left(\:8\:+\:3m\right)$
$\frac{\left(4a^{-2}\:b\:^{-1}\right)^{-3}}{\left(3a^{-1}\:b^2\:\right)\:^2}$
$10b-3ab^2$
$1 \frac { x } { x }$
$-68\cdot32$
$7x^2-4x-3$
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