3u+21=69

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Solution for 3u+21=69 equation: 



3u+21=69

We move all terms to the left:

3u+21-(69)=0

We add all the numbers together, and all the variables

3u-48=0

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

3u=48

u=48/3

u=16

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