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0.4y+4.7=12.4
We move all terms to the left:
0.4y+4.7-(12.4)=0
We add all the numbers together, and all the variables
0.4y-7.7=0
We move all terms containing y to the left, all other terms to the right
0.4y=7.7
y=7.7/0.4
y=19+0.1/0.4
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