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203=122-u
We move all terms to the left:
203-(122-u)=0
We add all the numbers together, and all the variables
-(-1u+122)+203=0
We get rid of parentheses
1u-122+203=0
We add all the numbers together, and all the variables
u+81=0
We move all terms containing u to the left, all other terms to the right
u=-81
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