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x+2x+(2x+100)=1100
We move all terms to the left:
x+2x+(2x+100)-(1100)=0
We add all the numbers together, and all the variables
3x+(2x+100)-1100=0
We get rid of parentheses
3x+2x+100-1100=0
We add all the numbers together, and all the variables
5x-1000=0
We move all terms containing x to the left, all other terms to the right
5x=1000
x=1000/5
x=200
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