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-12.4r-14.1r-19.94=17.86-13.9r
We move all terms to the left:
-12.4r-14.1r-19.94-(17.86-13.9r)=0
We add all the numbers together, and all the variables
-12.4r-14.1r-(-13.9r+17.86)-19.94=0
We add all the numbers together, and all the variables
-26.5r-(-13.9r+17.86)-19.94=0
We get rid of parentheses
-26.5r+13.9r-17.86-19.94=0
We add all the numbers together, and all the variables
-12.6r-37.8=0
We move all terms containing r to the left, all other terms to the right
-12.6r=37.8
r=37.8/-12.6
r=-3
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