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189=54-u
We move all terms to the left:
189-(54-u)=0
We add all the numbers together, and all the variables
-(-1u+54)+189=0
We get rid of parentheses
1u-54+189=0
We add all the numbers together, and all the variables
u+135=0
We move all terms containing u to the left, all other terms to the right
u=-135
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