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-13+19r-9r-6r-19r=20
We move all terms to the left:
-13+19r-9r-6r-19r-(20)=0
We add all the numbers together, and all the variables
-15r-33=0
We move all terms containing r to the left, all other terms to the right
-15r=33
r=33/-15
r=-2+1/5
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