-1=-7+2a

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Solution for -1=-7+2a equation: 



-1=-7+2a

We move all terms to the left:

-1-(-7+2a)=0

We add all the numbers together, and all the variables

-(2a-7)-1=0

We get rid of parentheses

-2a+7-1=0

We add all the numbers together, and all the variables

-2a+6=0

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

-2a=-6

a=-6/-2

a=+3

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