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2(-5)-y=10
We move all terms to the left:
2(-5)-y-(10)=0
determiningTheFunctionDomain -y-10+2(-5)=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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