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