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5(7.7r-3.8)=-3.4r+31.28
We move all terms to the left:
5(7.7r-3.8)-(-3.4r+31.28)=0
We multiply parentheses
35r-(-3.4r+31.28)-19=0
We get rid of parentheses
35r+3.4r-31.28-19=0
We add all the numbers together, and all the variables
38.4r-50.28=0
We move all terms containing r to the left, all other terms to the right
38.4r=50.28
r=50.28/38.4
r=1+6.3191489361702/20.425531914894
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