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-86=-8+6r
We move all terms to the left:
-86-(-8+6r)=0
We add all the numbers together, and all the variables
-(6r-8)-86=0
We get rid of parentheses
-6r+8-86=0
We add all the numbers together, and all the variables
-6r-78=0
We move all terms containing r to the left, all other terms to the right
-6r=78
r=78/-6
r=-13
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