-1=-7+a/21

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Solution for -1=-7+a/21 equation: 



-1=-7+a/21

We move all terms to the left:

-1-(-7+a/21)=0

We add all the numbers together, and all the variables

-(a/21-7)-1=0

We get rid of parentheses

-a/21+7-1=0

We multiply all the terms by the denominator


-a+7*21-1*21=0

We add all the numbers together, and all the variables

-1a+126=0

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

-a=-126

a=-126/-1

a=+126

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