-4=3(u+7)-8u

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Solution for -4=3(u+7)-8u equation: 



-4=3(u+7)-8u

We move all terms to the left:

-4-(3(u+7)-8u)=0



We calculate terms in parentheses: -(3(u+7)-8u), so:

3(u+7)-8u

We add all the numbers together, and all the variables

-8u+3(u+7)

We multiply parentheses

-8u+3u+21

We add all the numbers together, and all the variables

-5u+21

Back to the equation:

-(-5u+21)



We get rid of parentheses

5u-21-4=0

We add all the numbers together, and all the variables

5u-25=0

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

5u=25

u=25/5

u=5

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