20+3u=89

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Solution for 20+3u=89 equation: 



20+3u=89

We move all terms to the left:

20+3u-(89)=0

We add all the numbers together, and all the variables

3u-69=0

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

3u=69

u=69/3

u=23

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