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0.9y+2=y-0.4
We move all terms to the left:
0.9y+2-(y-0.4)=0
We get rid of parentheses
0.9y-y+0.4+2=0
We add all the numbers together, and all the variables
-0.1y+2.4=0
We move all terms containing y to the left, all other terms to the right
-0.1y=-2.4
y=-2.4/-0.1
y=23+0.1/0.1
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