3(u+7)=4u-28

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Solution for 3(u+7)=4u-28 equation: 



3(u+7)=4u-28

We move all terms to the left:

3(u+7)-(4u-28)=0

We multiply parentheses

3u-(4u-28)+21=0

We get rid of parentheses

3u-4u+28+21=0

We add all the numbers together, and all the variables

-1u+49=0

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

-u=-49

u=-49/-1

u=+49

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