-x-39=21-4x

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Solution for -x-39=21-4x equation: 



-x-39=21-4x

We move all terms to the left:

-x-39-(21-4x)=0

We add all the numbers together, and all the variables

-x-(-4x+21)-39=0

We add all the numbers together, and all the variables

-1x-(-4x+21)-39=0

We get rid of parentheses

-1x+4x-21-39=0

We add all the numbers together, and all the variables

3x-60=0

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

3x=60

x=60/3

x=20

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