4x+x+x=72

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Solution for 4x+x+x=72 equation: 



4x+x+x=72

We move all terms to the left:

4x+x+x-(72)=0

We add all the numbers together, and all the variables

6x-72=0

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

6x=72

x=72/6

x=12

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