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9y-7.8+1y=5.6y

We move all terms to the left:

9y-7.8+1y-(5.6y)=0

We add all the numbers together, and all the variables

9y+1y-(+5.6y)-7.8=0

We add all the numbers together, and all the variables

10y-(+5.6y)-7.8=0

We get rid of parentheses

10y-5.6y-7.8=0

We add all the numbers together, and all the variables

4.4y-7.8=0

We move all terms containing y to the left, all other terms to the right

4.4y=7.8

y=7.8/4.4

y=1+2.4285714285714/3.1428571428571

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