9u-1=-9+7u

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Solution for 9u-1=-9+7u equation: 



9u-1=-9+7u

We move all terms to the left:

9u-1-(-9+7u)=0

We add all the numbers together, and all the variables

9u-(7u-9)-1=0

We get rid of parentheses

9u-7u+9-1=0

We add all the numbers together, and all the variables

2u+8=0

We move all terms containing u to the left, all other terms to the right

2u=-8

u=-8/2

u=-4

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