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r in (-oo:+oo)
(r-3)/10 = r/16 // - r/16
(r-3)/10-(r/16) = 0
(r-3)/10-r/16 = 0
(16*(r-3))/(10*16)+(10*(-r))/(10*16) = 0
16*(r-3)+10*(-r) = 0
6*r-48 = 0
(6*r-48)/(10*16) = 0
(6*r-48)/(10*16) = 0 // * 10*16
6*r-48 = 0
6*r-48 = 0 // + 48
6*r = 48 // : 6
r = 48/6
r = 8
r = 8
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