3x+4x=39

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Solution for 3x+4x=39 equation: 



3x+4x=39

We move all terms to the left:

3x+4x-(39)=0

We add all the numbers together, and all the variables

7x-39=0

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

7x=39

x=39/7

x=5+4/7

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