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3.9=1.3y-2.6
We move all terms to the left:
3.9-(1.3y-2.6)=0
We get rid of parentheses
-1.3y+2.6+3.9=0
We add all the numbers together, and all the variables
-1.3y+6.5=0
We move all terms containing y to the left, all other terms to the right
-1.3y=-6.5
y=-6.5/-1.3
y=+5
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