-3x-7=21+4x

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



-3x-7=21+4x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-3x-4x-21-7=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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