9u=4u+20

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Solution for 9u=4u+20 equation: 



9u=4u+20

We move all terms to the left:

9u-(4u+20)=0

We get rid of parentheses

9u-4u-20=0

We add all the numbers together, and all the variables

5u-20=0

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

5u=20

u=20/5

u=4

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