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12.9=y+10.3
We move all terms to the left:
12.9-(y+10.3)=0
We get rid of parentheses
-y-10.3+12.9=0
We add all the numbers together, and all the variables
-1y+2.6=0
We move all terms containing y to the left, all other terms to the right
-y=-2.6
y=-2.6/-1
y=2+0.6/1
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