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55=1-9u
We move all terms to the left:
55-(1-9u)=0
We add all the numbers together, and all the variables
-(-9u+1)+55=0
We get rid of parentheses
9u-1+55=0
We add all the numbers together, and all the variables
9u+54=0
We move all terms containing u to the left, all other terms to the right
9u=-54
u=-54/9
u=-6
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