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15=19-y
We move all terms to the left:
15-(19-y)=0
We add all the numbers together, and all the variables
-(-1y+19)+15=0
We get rid of parentheses
1y-19+15=0
We add all the numbers together, and all the variables
y-4=0
We move all terms containing y to the left, all other terms to the right
y=4
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