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3.5=y+2.1
We move all terms to the left:
3.5-(y+2.1)=0
We get rid of parentheses
-y-2.1+3.5=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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