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18.78=17.9+y
We move all terms to the left:
18.78-(17.9+y)=0
We add all the numbers together, and all the variables
-(y+17.9)+18.78=0
We get rid of parentheses
-y-17.9+18.78=0
We add all the numbers together, and all the variables
-1y+0.88=0
We move all terms containing y to the left, all other terms to the right
-y=-0.88
y=-0.88/-1
y=0.88/1
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