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r in (-oo:+oo)
(-3/5)*(r+1/5) = 9/5 // - 9/5
(-3/5)*(r+1/5)-(9/5) = 0
(-3/5)*(r+1/5)-9/5 = 0
-3/5*(r+1/5)-9/5 = 0
(-3/5*5*(r+1/5))/5-9/5 = 0
-3/5*5*(r+1/5)-9 = 0
-3*r-48/5 = 0
(-3*r-48/5)/5 = 0
(-3*r-48/5)/5 = 0 // * 5
-3*r-48/5 = 0
-3*r-48/5 = 0 // + 48/5
-3*r = 48/5 // : -3
r = 48/5/(-3)
r = -16/5
r = -16/5
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