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15.5-y=7.9=8.4
We move all terms to the left:
15.5-y-(7.9)=0
We add all the numbers together, and all the variables
-1y+7.6=0
We move all terms containing y to the left, all other terms to the right
-y=-7.6
y=-7.6/-1
y=7+0.6/1
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