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36=-3(u-91)
We move all terms to the left:
36-(-3(u-91))=0
We calculate terms in parentheses: -(-3(u-91)), so:We get rid of parentheses
-3(u-91)
We multiply parentheses
-3u+273
Back to the equation:
-(-3u+273)
3u-273+36=0
We add all the numbers together, and all the variables
3u-237=0
We move all terms containing u to the left, all other terms to the right
3u=237
u=237/3
u=79
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