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2x+(2x+13.2)=87.2
We move all terms to the left:
2x+(2x+13.2)-(87.2)=0
We add all the numbers together, and all the variables
2x+(2x+13.2)-87.2=0
We get rid of parentheses
2x+2x+13.2-87.2=0
We add all the numbers together, and all the variables
4x-74=0
We move all terms containing x to the left, all other terms to the right
4x=74
x=74/4
x=18+1/2
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