$8-2-4+6-3+5$
$culo\:+\:culo$
$\frac{7u^2}{4u^3}$
$2x^4\:x\:5x^5$
$\left(3-b\right)\:^2$
$12x^2y-9xy^2$
$1-49a^2b^2$
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