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-6+8u=4+9u
We move all terms to the left:
-6+8u-(4+9u)=0
We add all the numbers together, and all the variables
8u-(9u+4)-6=0
We get rid of parentheses
8u-9u-4-6=0
We add all the numbers together, and all the variables
-1u-10=0
We move all terms containing u to the left, all other terms to the right
-u=10
u=10/-1
u=-10
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