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116=261-u
We move all terms to the left:
116-(261-u)=0
We add all the numbers together, and all the variables
-(-1u+261)+116=0
We get rid of parentheses
1u-261+116=0
We add all the numbers together, and all the variables
u-145=0
We move all terms containing u to the left, all other terms to the right
u=145
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