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3.4y+3.8=12.3
We move all terms to the left:
3.4y+3.8-(12.3)=0
We add all the numbers together, and all the variables
3.4y-8.5=0
We move all terms containing y to the left, all other terms to the right
3.4y=8.5
y=8.5/3.4
y=2+1/2
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