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