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(300-15)=y
We move all terms to the left:
(300-15)-(y)=0
We add all the numbers together, and all the variables
-y+285=0
We add all the numbers together, and all the variables
-1y+285=0
We move all terms containing y to the left, all other terms to the right
-y=-285
y=-285/-1
y=+285
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