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61=-u+219
We move all terms to the left:
61-(-u+219)=0
We add all the numbers together, and all the variables
-(-1u+219)+61=0
We get rid of parentheses
1u-219+61=0
We add all the numbers together, and all the variables
u-158=0
We move all terms containing u to the left, all other terms to the right
u=158
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