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-9(1.1r+0.32)=-19+3.7r
We move all terms to the left:
-9(1.1r+0.32)-(-19+3.7r)=0
We add all the numbers together, and all the variables
-9(1.1r+0.32)-(3.7r-19)=0
We multiply parentheses
-9r-(3.7r-19)-2.88=0
We get rid of parentheses
-9r-3.7r+19-2.88=0
We add all the numbers together, and all the variables
-12.7r+16.12=0
We move all terms containing r to the left, all other terms to the right
-12.7r=-16.12
r=-16.12/-12.7
r=1+1/3.7134502923977
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