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0.2x+1=0.4x-3.1
We move all terms to the left:
0.2x+1-(0.4x-3.1)=0
We get rid of parentheses
0.2x-0.4x+3.1+1=0
We add all the numbers together, and all the variables
-0.2x+4.1=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-4.1
x=-4.1/-0.2
x=20+0.1/0.2
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