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156=-u+219
We move all terms to the left:
156-(-u+219)=0
We add all the numbers together, and all the variables
-(-1u+219)+156=0
We get rid of parentheses
1u-219+156=0
We add all the numbers together, and all the variables
u-63=0
We move all terms containing u to the left, all other terms to the right
u=63
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