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77=4u+13
We move all terms to the left:
77-(4u+13)=0
We get rid of parentheses
-4u-13+77=0
We add all the numbers together, and all the variables
-4u+64=0
We move all terms containing u to the left, all other terms to the right
-4u=-64
u=-64/-4
u=+16
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