21+6u=75

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Solution for 21+6u=75 equation: 



21+6u=75

We move all terms to the left:

21+6u-(75)=0

We add all the numbers together, and all the variables

6u-54=0

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

6u=54

u=54/6

u=9

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