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-2.1=y-3.5
We move all terms to the left:
-2.1-(y-3.5)=0
We get rid of parentheses
-y+3.5-2.1=0
We add all the numbers together, and all the variables
-1y+1.4=0
We move all terms containing y to the left, all other terms to the right
-y=-1.4
y=-1.4/-1
y=1+0.4/1
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