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2.3=7.8+y
We move all terms to the left:
2.3-(7.8+y)=0
We add all the numbers together, and all the variables
-(y+7.8)+2.3=0
We get rid of parentheses
-y-7.8+2.3=0
We add all the numbers together, and all the variables
-1y-5.5=0
We move all terms containing y to the left, all other terms to the right
-y=5.5
y=5.5/-1
y=-5+0.5/1
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