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246=6-u
We move all terms to the left:
246-(6-u)=0
We add all the numbers together, and all the variables
-(-1u+6)+246=0
We get rid of parentheses
1u-6+246=0
We add all the numbers together, and all the variables
u+240=0
We move all terms containing u to the left, all other terms to the right
u=-240
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