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0.2x+0.1=0.4x-0.9
We move all terms to the left:
0.2x+0.1-(0.4x-0.9)=0
We get rid of parentheses
0.2x-0.4x+0.9+0.1=0
We add all the numbers together, and all the variables
-0.2x+1=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-1
x=-1/-0.2
x=+5
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