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78=9u+6
We move all terms to the left:
78-(9u+6)=0
We get rid of parentheses
-9u-6+78=0
We add all the numbers together, and all the variables
-9u+72=0
We move all terms containing u to the left, all other terms to the right
-9u=-72
u=-72/-9
u=+8
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