21-7x=3x-7

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Solution for 21-7x=3x-7 equation: 



21-7x=3x-7

We move all terms to the left:

21-7x-(3x-7)=0

We get rid of parentheses

-7x-3x+7+21=0

We add all the numbers together, and all the variables

-10x+28=0

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

-10x=-28

x=-28/-10

x=2+4/5

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