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13+4.7-y=10.4
We move all terms to the left:
13+4.7-y-(10.4)=0
We add all the numbers together, and all the variables
-1y+7.3=0
We move all terms containing y to the left, all other terms to the right
-y=-7.3
y=-7.3/-1
y=7+0.3/1
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