12-6.5a=77

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Solution for 12-6.5a=77 equation: 



12-6.5a=77

We move all terms to the left:

12-6.5a-(77)=0

We add all the numbers together, and all the variables

-6.5a-65=0

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

-6.5a=65

a=65/-6.5

a=-10

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