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1.3(3.1r-10.4)=16
We move all terms to the left:
1.3(3.1r-10.4)-(16)=0
We multiply parentheses
3.9r-13.52-16=0
We add all the numbers together, and all the variables
3.9r-29.52=0
We move all terms containing r to the left, all other terms to the right
3.9r=29.52
r=29.52/3.9
r=7+2.22/3.9
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