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20x-9=40x-7
We move all terms to the left:
20x-9-(40x-7)=0
We get rid of parentheses
20x-40x+7-9=0
We add all the numbers together, and all the variables
-20x-2=0
We move all terms containing x to the left, all other terms to the right
-20x=2
x=2/-20
x=-1/10
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