u+6u=28

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Solution for u+6u=28 equation: 



u+6u=28

We move all terms to the left:

u+6u-(28)=0

We add all the numbers together, and all the variables

7u-28=0

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

7u=28

u=28/7

u=4

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