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3.4=4y-9.4
We move all terms to the left:
3.4-(4y-9.4)=0
We get rid of parentheses
-4y+9.4+3.4=0
We add all the numbers together, and all the variables
-4y+12.8=0
We move all terms containing y to the left, all other terms to the right
-4y=-12.8
y=-12.8/-4
y=3+0.8/4
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