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100=10+9u
We move all terms to the left:
100-(10+9u)=0
We add all the numbers together, and all the variables
-(9u+10)+100=0
We get rid of parentheses
-9u-10+100=0
We add all the numbers together, and all the variables
-9u+90=0
We move all terms containing u to the left, all other terms to the right
-9u=-90
u=-90/-9
u=+10
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