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273=210-u
We move all terms to the left:
273-(210-u)=0
We add all the numbers together, and all the variables
-(-1u+210)+273=0
We get rid of parentheses
1u-210+273=0
We add all the numbers together, and all the variables
u+63=0
We move all terms containing u to the left, all other terms to the right
u=-63
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