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13u=8+9u
We move all terms to the left:
13u-(8+9u)=0
We add all the numbers together, and all the variables
13u-(9u+8)=0
We get rid of parentheses
13u-9u-8=0
We add all the numbers together, and all the variables
4u-8=0
We move all terms containing u to the left, all other terms to the right
4u=8
u=8/4
u=2
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