31=12x-3x+4

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Solution for 31=12x-3x+4 equation: 



31=12x-3x+4

We move all terms to the left:

31-(12x-3x+4)=0

We add all the numbers together, and all the variables

-(9x+4)+31=0

We get rid of parentheses

-9x-4+31=0

We add all the numbers together, and all the variables

-9x+27=0

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

-9x=-27

x=-27/-9

x=+3

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