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0.2y-2.1=0.5y-3.45
We move all terms to the left:
0.2y-2.1-(0.5y-3.45)=0
We get rid of parentheses
0.2y-0.5y+3.45-2.1=0
We add all the numbers together, and all the variables
-0.3y+1.35=0
We move all terms containing y to the left, all other terms to the right
-0.3y=-1.35
y=-1.35/-0.3
y=4+0.15/0.3
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