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208=-u+40
We move all terms to the left:
208-(-u+40)=0
We add all the numbers together, and all the variables
-(-1u+40)+208=0
We get rid of parentheses
1u-40+208=0
We add all the numbers together, and all the variables
u+168=0
We move all terms containing u to the left, all other terms to the right
u=-168
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