20u-13=20+9u

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Solution for 20u-13=20+9u equation: 



20u-13=20+9u

We move all terms to the left:

20u-13-(20+9u)=0

We add all the numbers together, and all the variables

20u-(9u+20)-13=0

We get rid of parentheses

20u-9u-20-13=0

We add all the numbers together, and all the variables

11u-33=0

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

11u=33

u=33/11

u=3

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