v+8=(3v+4-v)-21+4

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Solution for v+8=(3v+4-v)-21+4 equation: 



v+8=(3v+4-v)-21+4

We move all terms to the left:

v+8-((3v+4-v)-21+4)=0

We add all the numbers together, and all the variables

v-((2v+4)-21+4)+8=0



We calculate terms in parentheses: -((2v+4)-21+4), so:

(2v+4)-21+4

We add all the numbers together, and all the variables

(2v+4)-17

We get rid of parentheses

2v+4-17

We add all the numbers together, and all the variables

2v-13

Back to the equation:

-(2v-13)



We get rid of parentheses

v-2v+13+8=0

We add all the numbers together, and all the variables

-1v+21=0

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

-v=-21

v=-21/-1

v=+21

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