21-x=48-4x

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Solution for 21-x=48-4x equation: 



21-x=48-4x

We move all terms to the left:

21-x-(48-4x)=0

We add all the numbers together, and all the variables

-x-(-4x+48)+21=0

We add all the numbers together, and all the variables

-1x-(-4x+48)+21=0

We get rid of parentheses

-1x+4x-48+21=0

We add all the numbers together, and all the variables

3x-27=0

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

3x=27

x=27/3

x=9

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