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-7u=2u+6
We move all terms to the left:
-7u-(2u+6)=0
We get rid of parentheses
-7u-2u-6=0
We add all the numbers together, and all the variables
-9u-6=0
We move all terms containing u to the left, all other terms to the right
-9u=6
u=6/-9
u=-2/3
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