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2(6r+3)=-18
We move all terms to the left:
2(6r+3)-(-18)=0
We add all the numbers together, and all the variables
2(6r+3)+18=0
We multiply parentheses
12r+6+18=0
We add all the numbers together, and all the variables
12r+24=0
We move all terms containing r to the left, all other terms to the right
12r=-24
r=-24/12
r=-2
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