x+3x+x+4=39

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Solution for x+3x+x+4=39 equation: 



x+3x+x+4=39

We move all terms to the left:

x+3x+x+4-(39)=0

We add all the numbers together, and all the variables

5x-35=0

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

5x=35

x=35/5

x=7

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