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7.9y-12.4-2.3y=15.6
We move all terms to the left:
7.9y-12.4-2.3y-(15.6)=0
We add all the numbers together, and all the variables
5.6y-28=0
We move all terms containing y to the left, all other terms to the right
5.6y=28
y=28/5.6
y=5
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