21=-7+4x

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Solution for 21=-7+4x equation: 



21=-7+4x

We move all terms to the left:

21-(-7+4x)=0

We add all the numbers together, and all the variables

-(4x-7)+21=0

We get rid of parentheses

-4x+7+21=0

We add all the numbers together, and all the variables

-4x+28=0

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

-4x=-28

x=-28/-4

x=+7

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