-21=8-2x+7

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Solution for -21=8-2x+7 equation: 



-21=8-2x+7

We move all terms to the left:

-21-(8-2x+7)=0

We add all the numbers together, and all the variables

-(-2x+15)-21=0

We get rid of parentheses

2x-15-21=0

We add all the numbers together, and all the variables

2x-36=0

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

2x=36

x=36/2

x=18

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