x+x+2x=28

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Solution for x+x+2x=28 equation: 



x+x+2x=28

We move all terms to the left:

x+x+2x-(28)=0

We add all the numbers together, and all the variables

4x-28=0

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

4x=28

x=28/4

x=7

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