-1-3a=-7

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Solution for -1-3a=-7 equation: 



-1-3a=-7

We move all terms to the left:

-1-3a-(-7)=0

We add all the numbers together, and all the variables

-3a+6=0

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

-3a=-6

a=-6/-3

a=+2

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