x+2x+x+2x=12

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Solution for x+2x+x+2x=12 equation: 



x+2x+x+2x=12

We move all terms to the left:

x+2x+x+2x-(12)=0

We add all the numbers together, and all the variables

6x-12=0

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

6x=12

x=12/6

x=2

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