3a-7=-91

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Solution for 3a-7=-91 equation: 



3a-7=-91

We move all terms to the left:

3a-7-(-91)=0

We add all the numbers together, and all the variables

3a+84=0

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

3a=-84

a=-84/3

a=-28

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