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137=-u+214
We move all terms to the left:
137-(-u+214)=0
We add all the numbers together, and all the variables
-(-1u+214)+137=0
We get rid of parentheses
1u-214+137=0
We add all the numbers together, and all the variables
u-77=0
We move all terms containing u to the left, all other terms to the right
u=77
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