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28-r/5=-8
We move all terms to the left:
28-r/5-(-8)=0
We add all the numbers together, and all the variables
-r/5+36=0
We multiply all the terms by the denominator
-r+36*5=0
We add all the numbers together, and all the variables
-1r+180=0
We move all terms containing r to the left, all other terms to the right
-r=-180
r=-180/-1
r=+180
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