21=20+v/3

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Solution for 21=20+v/3 equation: 



21=20+v/3

We move all terms to the left:

21-(20+v/3)=0

We add all the numbers together, and all the variables

-(v/3+20)+21=0

We get rid of parentheses

-v/3-20+21=0

We multiply all the terms by the denominator


-v-20*3+21*3=0

We add all the numbers together, and all the variables

-1v+3=0

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

-v=-3

v=-3/-1

v=+3

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