u=42-6u

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Solution for u=42-6u equation: 



u=42-6u

We move all terms to the left:

u-(42-6u)=0

We add all the numbers together, and all the variables

u-(-6u+42)=0

We get rid of parentheses

u+6u-42=0

We add all the numbers together, and all the variables

7u-42=0

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

7u=42

u=42/7

u=6

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