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0.5-0.3y=2.1
We move all terms to the left:
0.5-0.3y-(2.1)=0
We add all the numbers together, and all the variables
-0.3y-1.6=0
We move all terms containing y to the left, all other terms to the right
-0.3y=1.6
y=1.6/-0.3
y=-5+0.1/0.3
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