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5.5x+5.5(x+20)=220
We move all terms to the left:
5.5x+5.5(x+20)-(220)=0
We multiply parentheses
5.5x+5.5x+110-220=0
We add all the numbers together, and all the variables
11x-110=0
We move all terms containing x to the left, all other terms to the right
11x=110
x=110/11
x=10
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