x+2x+2(2x)=100

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Solution for x+2x+2(2x)=100 equation: 



x+2x+2(2x)=100

We move all terms to the left:

x+2x+2(2x)-(100)=0

We add all the numbers together, and all the variables

25x-100=0

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

25x=100

x=100/25

x=4

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