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5u=-7+6u
We move all terms to the left:
5u-(-7+6u)=0
We add all the numbers together, and all the variables
5u-(6u-7)=0
We get rid of parentheses
5u-6u+7=0
We add all the numbers together, and all the variables
-1u+7=0
We move all terms containing u to the left, all other terms to the right
-u=-7
u=-7/-1
u=+7
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