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13u=35+8u
We move all terms to the left:
13u-(35+8u)=0
We add all the numbers together, and all the variables
13u-(8u+35)=0
We get rid of parentheses
13u-8u-35=0
We add all the numbers together, and all the variables
5u-35=0
We move all terms containing u to the left, all other terms to the right
5u=35
u=35/5
u=7
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