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2(r+10)+-3=1
We move all terms to the left:
2(r+10)+-3-(1)=0
determiningTheFunctionDomain 2(r+10)-3-1+=0
We add all the numbers together, and all the variables
2(r+10)=0
We multiply parentheses
2r+20=0
We move all terms containing r to the left, all other terms to the right
2r=-20
r=-20/2
r=-10
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