3x+1x=39

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Solution for 3x+1x=39 equation: 



3x+1x=39

We move all terms to the left:

3x+1x-(39)=0

We add all the numbers together, and all the variables

4x-39=0

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

4x=39

x=39/4

x=9+3/4

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