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19=1-8r+5r
We move all terms to the left:
19-(1-8r+5r)=0
We add all the numbers together, and all the variables
-(-3r+1)+19=0
We get rid of parentheses
3r-1+19=0
We add all the numbers together, and all the variables
3r+18=0
We move all terms containing r to the left, all other terms to the right
3r=-18
r=-18/3
r=-6
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