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7.8y-4.9-5.6y=2.3
We move all terms to the left:
7.8y-4.9-5.6y-(2.3)=0
We add all the numbers together, and all the variables
2.2y-7.2=0
We move all terms containing y to the left, all other terms to the right
2.2y=7.2
y=7.2/2.2
y=3+0.6/2.2
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