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-6.3r-19.9=-3.9r-9.82
We move all terms to the left:
-6.3r-19.9-(-3.9r-9.82)=0
We get rid of parentheses
-6.3r+3.9r+9.82-19.9=0
We add all the numbers together, and all the variables
-2.4r-10.08=0
We move all terms containing r to the left, all other terms to the right
-2.4r=10.08
r=10.08/-2.4
r=-4+0.48/2.4
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