31-20+9a=47

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Solution for 31-20+9a=47 equation: 



31-20+9a=47

We move all terms to the left:

31-20+9a-(47)=0

We add all the numbers together, and all the variables

9a-36=0

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

9a=36

a=36/9

a=4

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