-7a-9=-100

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Solution for -7a-9=-100 equation: 



-7a-9=-100

We move all terms to the left:

-7a-9-(-100)=0

We add all the numbers together, and all the variables

-7a+91=0

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

-7a=-91

a=-91/-7

a=+13

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