2x+2x+x=80

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Solution for 2x+2x+x=80 equation: 



2x+2x+x=80

We move all terms to the left:

2x+2x+x-(80)=0

We add all the numbers together, and all the variables

5x-80=0

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

5x=80

x=80/5

x=16

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