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-9+5(-3r-2)=-139
We move all terms to the left:
-9+5(-3r-2)-(-139)=0
We add all the numbers together, and all the variables
5(-3r-2)+130=0
We multiply parentheses
-15r-10+130=0
We add all the numbers together, and all the variables
-15r+120=0
We move all terms containing r to the left, all other terms to the right
-15r=-120
r=-120/-15
r=+8
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