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2(r+4)=-20
We move all terms to the left:
2(r+4)-(-20)=0
We add all the numbers together, and all the variables
2(r+4)+20=0
We multiply parentheses
2r+8+20=0
We add all the numbers together, and all the variables
2r+28=0
We move all terms containing r to the left, all other terms to the right
2r=-28
r=-28/2
r=-14
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