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13u=48+5u
We move all terms to the left:
13u-(48+5u)=0
We add all the numbers together, and all the variables
13u-(5u+48)=0
We get rid of parentheses
13u-5u-48=0
We add all the numbers together, and all the variables
8u-48=0
We move all terms containing u to the left, all other terms to the right
8u=48
u=48/8
u=6
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