2x=21-x=7

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Solution for 2x=21-x=7 equation: 



2x=21-x=7

We move all terms to the left:

2x-(21-x)=0

We add all the numbers together, and all the variables

2x-(-1x+21)=0

We get rid of parentheses

2x+1x-21=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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