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64=3u+13
We move all terms to the left:
64-(3u+13)=0
We get rid of parentheses
-3u-13+64=0
We add all the numbers together, and all the variables
-3u+51=0
We move all terms containing u to the left, all other terms to the right
-3u=-51
u=-51/-3
u=+17
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