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8=-6u+9u-1
We move all terms to the left:
8-(-6u+9u-1)=0
We add all the numbers together, and all the variables
-(3u-1)+8=0
We get rid of parentheses
-3u+1+8=0
We add all the numbers together, and all the variables
-3u+9=0
We move all terms containing u to the left, all other terms to the right
-3u=-9
u=-9/-3
u=+3
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