-21=7+4x+3x

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Solution for -21=7+4x+3x equation: 



-21=7+4x+3x

We move all terms to the left:

-21-(7+4x+3x)=0

We add all the numbers together, and all the variables

-(7x+7)-21=0

We get rid of parentheses

-7x-7-21=0

We add all the numbers together, and all the variables

-7x-28=0

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

-7x=28

x=28/-7

x=-4

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