13u=42+7u

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Solution for 13u=42+7u equation: 



13u=42+7u

We move all terms to the left:

13u-(42+7u)=0

We add all the numbers together, and all the variables

13u-(7u+42)=0

We get rid of parentheses

13u-7u-42=0

We add all the numbers together, and all the variables

6u-42=0

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

6u=42

u=42/6

u=7

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