21+9u=75

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Solution for 21+9u=75 equation: 



21+9u=75

We move all terms to the left:

21+9u-(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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