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15.8=y-4.2
We move all terms to the left:
15.8-(y-4.2)=0
We get rid of parentheses
-y+4.2+15.8=0
We add all the numbers together, and all the variables
-1y+20=0
We move all terms containing y to the left, all other terms to the right
-y=-20
y=-20/-1
y=+20
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