45=117-9u

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Solution for 45=117-9u equation: 



45=117-9u

We move all terms to the left:

45-(117-9u)=0

We add all the numbers together, and all the variables

-(-9u+117)+45=0

We get rid of parentheses

9u-117+45=0

We add all the numbers together, and all the variables

9u-72=0

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

9u=72

u=72/9

u=8

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