8a+5a=-91

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Solution for 8a+5a=-91 equation: 



8a+5a=-91

We move all terms to the left:

8a+5a-(-91)=0

We add all the numbers together, and all the variables

13a+91=0

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

13a=-91

a=-91/13

a=-7

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