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20x+0.45=40x+0.25
We move all terms to the left:
20x+0.45-(40x+0.25)=0
We get rid of parentheses
20x-40x-0.25+0.45=0
We add all the numbers together, and all the variables
-20x+0.2=0
We move all terms containing x to the left, all other terms to the right
-20x=-0.2
x=-0.2/-20
x=0.2/20
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