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12*0-30y=1800
We move all terms to the left:
12*0-30y-(1800)=0
determiningTheFunctionDomain -30y-1800+12*0=0
We add all the numbers together, and all the variables
-30y-1800=0
We move all terms containing y to the left, all other terms to the right
-30y=1800
y=1800/-30
y=-60
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