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1.3y-13=3.9
We move all terms to the left:
1.3y-13-(3.9)=0
We add all the numbers together, and all the variables
1.3y-16.9=0
We move all terms containing y to the left, all other terms to the right
1.3y=16.9
y=16.9/1.3
y=12+1/1
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