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