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0.4+0.5y=20
We move all terms to the left:
0.4+0.5y-(20)=0
We add all the numbers together, and all the variables
0.5y-19.6=0
We move all terms containing y to the left, all other terms to the right
0.5y=19.6
y=19.6/0.5
y=39+0.1/0.5
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