21x=7-x

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Solution for 21x=7-x equation: 



21x=7-x

We move all terms to the left:

21x-(7-x)=0

We add all the numbers together, and all the variables

21x-(-1x+7)=0

We get rid of parentheses

21x+1x-7=0

We add all the numbers together, and all the variables

22x-7=0

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

22x=7

x=7/22

x=7/22

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