7a-1=139

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Solution for 7a-1=139 equation: 



7a-1=139

We move all terms to the left:

7a-1-(139)=0

We add all the numbers together, and all the variables

7a-140=0

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

7a=140

a=140/7

a=20

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