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210=127-u
We move all terms to the left:
210-(127-u)=0
We add all the numbers together, and all the variables
-(-1u+127)+210=0
We get rid of parentheses
1u-127+210=0
We add all the numbers together, and all the variables
u+83=0
We move all terms containing u to the left, all other terms to the right
u=-83
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