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0.2x-0.5=0.3x-0.4
We move all terms to the left:
0.2x-0.5-(0.3x-0.4)=0
We get rid of parentheses
0.2x-0.3x+0.4-0.5=0
We add all the numbers together, and all the variables
-0.1x-0.1=0
We move all terms containing x to the left, all other terms to the right
-0.1x=0.1
x=0.1/-0.1
x=-1
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