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2.2=8.4+y
We move all terms to the left:
2.2-(8.4+y)=0
We add all the numbers together, and all the variables
-(y+8.4)+2.2=0
We get rid of parentheses
-y-8.4+2.2=0
We add all the numbers together, and all the variables
-1y-6.2=0
We move all terms containing y to the left, all other terms to the right
-y=6.2
y=6.2/-1
y=-6+0.2/1
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