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2y+2.9=21.2
We move all terms to the left:
2y+2.9-(21.2)=0
We add all the numbers together, and all the variables
2y-18.3=0
We move all terms containing y to the left, all other terms to the right
2y=18.3
y=18.3/2
y=9+0.3/2
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