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-7u+3=-6u
We move all terms to the left:
-7u+3-(-6u)=0
We get rid of parentheses
-7u+6u+3=0
We add all the numbers together, and all the variables
-1u+3=0
We move all terms containing u to the left, all other terms to the right
-u=-3
u=-3/-1
u=+3
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