20-7a-a=19

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Solution for 20-7a-a=19 equation: 



20-7a-a=19

We move all terms to the left:

20-7a-a-(19)=0

We add all the numbers together, and all the variables

-8a+1=0

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

-8a=-1

a=-1/-8

a=1/8

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