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r in (-oo:+oo)
(-6/5)*r+3*r = (1/3)*r+22/3 // - (1/3)*r+22/3
(-6/5)*r+3*r-((1/3)*r)-(22/3) = 0
(-6/5)*r+3*r+(-1/3)*r-22/3 = 0
22/15*r-22/3 = 0 // + 22/3
22/15*r = 22/3 // : 22/15
r = 22/3/22/15
r = 5
r = 5
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