-3-a=-7

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Solution for -3-a=-7 equation: 



-3-a=-7

We move all terms to the left:

-3-a-(-7)=0

We add all the numbers together, and all the variables

-1a+4=0

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

-a=-4

a=-4/-1

a=+4

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