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0.20x+4=0.40x+2
We move all terms to the left:
0.20x+4-(0.40x+2)=0
We get rid of parentheses
0.20x-0.40x-2+4=0
We add all the numbers together, and all the variables
-0.2x+2=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-2
x=-2/-0.2
x=+10
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