3u=40+5u

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Solution for 3u=40+5u equation: 



3u=40+5u

We move all terms to the left:

3u-(40+5u)=0

We add all the numbers together, and all the variables

3u-(5u+40)=0

We get rid of parentheses

3u-5u-40=0

We add all the numbers together, and all the variables

-2u-40=0

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

-2u=40

u=40/-2

u=-20

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