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247=189-u
We move all terms to the left:
247-(189-u)=0
We add all the numbers together, and all the variables
-(-1u+189)+247=0
We get rid of parentheses
1u-189+247=0
We add all the numbers together, and all the variables
u+58=0
We move all terms containing u to the left, all other terms to the right
u=-58
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