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19=6r-11
We move all terms to the left:
19-(6r-11)=0
We get rid of parentheses
-6r+11+19=0
We add all the numbers together, and all the variables
-6r+30=0
We move all terms containing r to the left, all other terms to the right
-6r=-30
r=-30/-6
r=+5
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