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3(u-8)-4=-4(-7u+9)-9u
We move all terms to the left:
3(u-8)-4-(-4(-7u+9)-9u)=0
We multiply parentheses
3u-(-4(-7u+9)-9u)-24-4=0
We calculate terms in parentheses: -(-4(-7u+9)-9u), so:We add all the numbers together, and all the variables
-4(-7u+9)-9u
We add all the numbers together, and all the variables
-9u-4(-7u+9)
We multiply parentheses
-9u+28u-36
We add all the numbers together, and all the variables
19u-36
Back to the equation:
-(19u-36)
3u-(19u-36)-28=0
We get rid of parentheses
3u-19u+36-28=0
We add all the numbers together, and all the variables
-16u+8=0
We move all terms containing u to the left, all other terms to the right
-16u=-8
u=-8/-16
u=1/2
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