3,1x+3,2x-4,3x=12

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Solution for 3,1x+3,2x-4,3x=12 equation: 



3.1x+3.2x-4.3x=12

We move all terms to the left:

3.1x+3.2x-4.3x-(12)=0

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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