-21-4x=15-7x

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Solution for -21-4x=15-7x equation: 



-21-4x=15-7x

We move all terms to the left:

-21-4x-(15-7x)=0

We add all the numbers together, and all the variables

-4x-(-7x+15)-21=0

We get rid of parentheses

-4x+7x-15-21=0

We add all the numbers together, and all the variables

3x-36=0

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

3x=36

x=36/3

x=12

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