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100+0.20x=40+0.40x
We move all terms to the left:
100+0.20x-(40+0.40x)=0
We add all the numbers together, and all the variables
0.20x-(0.40x+40)+100=0
We get rid of parentheses
0.20x-0.40x-40+100=0
We add all the numbers together, and all the variables
-0.2x+60=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-60
x=-60/-0.2
x=+300
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