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276=185-u
We move all terms to the left:
276-(185-u)=0
We add all the numbers together, and all the variables
-(-1u+185)+276=0
We get rid of parentheses
1u-185+276=0
We add all the numbers together, and all the variables
u+91=0
We move all terms containing u to the left, all other terms to the right
u=-91
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