u+9u=20

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Solution for u+9u=20 equation: 



u+9u=20

We move all terms to the left:

u+9u-(20)=0

We add all the numbers together, and all the variables

10u-20=0

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

10u=20

u=20/10

u=2

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