9u=u+40

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Solution for 9u=u+40 equation: 



9u=u+40

We move all terms to the left:

9u-(u+40)=0

We get rid of parentheses

9u-u-40=0

We add all the numbers together, and all the variables

8u-40=0

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

8u=40

u=40/8

u=5

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