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126=206-u
We move all terms to the left:
126-(206-u)=0
We add all the numbers together, and all the variables
-(-1u+206)+126=0
We get rid of parentheses
1u-206+126=0
We add all the numbers together, and all the variables
u-80=0
We move all terms containing u to the left, all other terms to the right
u=80
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