r=-199/80 is the right answer. First, you had to multiply by 100 from both sides of the equation. And it gave us, [tex]3.2r*100+14.7*100=6.74*100[/tex]. Next, you had to refine, and it gave us, [tex]320r+1470=674[/tex]. Then, subtract by 1470 from both sides of equation. And it gave us, [tex]320r+1470-1470=674-1470[/tex]. Simplify, and it gave us, [tex]320r=-796[/tex]. You can also divide by 320 from both sides of equation. And it gave us, [tex]\frac{320r}{320}=\frac{-796}{320}[/tex]. And finally, simplify, and it gave us the answer is r=-199/80 is the right answer. Hope this helps! And thank you for posting your question at here on brainly. And have a great day! -Charlie
