78-6=84a

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Solution for 78-6=84a equation: 



78-6=84a

We move all terms to the left:

78-6-(84a)=0

We add all the numbers together, and all the variables

-84a+72=0

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

-84a=-72

a=-72/-84

a=6/7

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