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(-12)=5r+8
We move all terms to the left:
(-12)-(5r+8)=0
We add all the numbers together, and all the variables
-(5r+8)-12=0
We get rid of parentheses
-5r-8-12=0
We add all the numbers together, and all the variables
-5r-20=0
We move all terms containing r to the left, all other terms to the right
-5r=20
r=20/-5
r=-4
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