9u+21=75

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Solution for 9u+21=75 equation: 



9u+21=75

We move all terms to the left:

9u+21-(75)=0

We add all the numbers together, and all the variables

9u-54=0

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

9u=54

u=54/9

u=6

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