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13u=5u+64
We move all terms to the left:
13u-(5u+64)=0
We get rid of parentheses
13u-5u-64=0
We add all the numbers together, and all the variables
8u-64=0
We move all terms containing u to the left, all other terms to the right
8u=64
u=64/8
u=8
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