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198=81-u
We move all terms to the left:
198-(81-u)=0
We add all the numbers together, and all the variables
-(-1u+81)+198=0
We get rid of parentheses
1u-81+198=0
We add all the numbers together, and all the variables
u+117=0
We move all terms containing u to the left, all other terms to the right
u=-117
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