3+9u=75

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Solution for 3+9u=75 equation: 



3+9u=75

We move all terms to the left:

3+9u-(75)=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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