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5y+9.3=21.8
We move all terms to the left:
5y+9.3-(21.8)=0
We add all the numbers together, and all the variables
5y-12.5=0
We move all terms containing y to the left, all other terms to the right
5y=12.5
y=12.5/5
y=2+2.5/5
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