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3y-2.1=10.4
We move all terms to the left:
3y-2.1-(10.4)=0
We add all the numbers together, and all the variables
3y-12.5=0
We move all terms containing y to the left, all other terms to the right
3y=12.5
y=12.5/3
y=4+0.5/3
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