-x+21=15-7x

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



-x+21=15-7x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1x-(-7x+15)+21=0

We get rid of parentheses

-1x+7x-15+21=0

We add all the numbers together, and all the variables

6x+6=0

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

6x=-6

x=-6/6

x=-1

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