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-6u+9=10+9u
We move all terms to the left:
-6u+9-(10+9u)=0
We add all the numbers together, and all the variables
-6u-(9u+10)+9=0
We get rid of parentheses
-6u-9u-10+9=0
We add all the numbers together, and all the variables
-15u-1=0
We move all terms containing u to the left, all other terms to the right
-15u=1
u=1/-15
u=-1/15
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