3x=21+x

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Solution for 3x=21+x equation: 



3x=21+x

We move all terms to the left:

3x-(21+x)=0

We add all the numbers together, and all the variables

3x-(x+21)=0

We get rid of parentheses

3x-x-21=0

We add all the numbers together, and all the variables

2x-21=0

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

2x=21

x=21/2

x=10+1/2

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