-a-7a=-16

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Solution for -a-7a=-16 equation: 



-a-7a=-16

We move all terms to the left:

-a-7a-(-16)=0

We add all the numbers together, and all the variables

-8a+16=0

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

-8a=-16

a=-16/-8

a=+2

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