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174=66-u
We move all terms to the left:
174-(66-u)=0
We add all the numbers together, and all the variables
-(-1u+66)+174=0
We get rid of parentheses
1u-66+174=0
We add all the numbers together, and all the variables
u+108=0
We move all terms containing u to the left, all other terms to the right
u=-108
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