31-3a=4

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Solution for 31-3a=4 equation: 



31-3a=4

We move all terms to the left:

31-3a-(4)=0

We add all the numbers together, and all the variables

-3a+27=0

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

-3a=-27

a=-27/-3

a=+9

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