-13=3(u-7)-7u

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Solution for -13=3(u-7)-7u equation: 



-13=3(u-7)-7u

We move all terms to the left:

-13-(3(u-7)-7u)=0



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

3(u-7)-7u

We add all the numbers together, and all the variables

-7u+3(u-7)

We multiply parentheses

-7u+3u-21

We add all the numbers together, and all the variables

-4u-21

Back to the equation:

-(-4u-21)



We get rid of parentheses

4u+21-13=0

We add all the numbers together, and all the variables

4u+8=0

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

4u=-8

u=-8/4

u=-2

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