-2a-1=-7

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



-2a-1=-7

We move all terms to the left:

-2a-1-(-7)=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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