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400+20x=65x+20x
We move all terms to the left:
400+20x-(65x+20x)=0
We add all the numbers together, and all the variables
20x-(+85x)+400=0
We get rid of parentheses
20x-85x+400=0
We add all the numbers together, and all the variables
-65x+400=0
We move all terms containing x to the left, all other terms to the right
-65x=-400
x=-400/-65
x=6+2/13
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