x+2x+x+2x=72.

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Solution for x+2x+x+2x=72. equation: 



x+2x+x+2x=72.

We move all terms to the left:

x+2x+x+2x-(72.)=0

We add all the numbers together, and all the variables

x+2x+x+2x-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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