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80x+0.22=100x+0.12
We move all terms to the left:
80x+0.22-(100x+0.12)=0
We get rid of parentheses
80x-100x-0.12+0.22=0
We add all the numbers together, and all the variables
-20x+0.1=0
We move all terms containing x to the left, all other terms to the right
-20x=-0.1
x=-0.1/-20
x=0.1/20
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