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r in (-oo:+oo)
(2/3)*((3/5)*r-6) = -6 // + 6
(2/3)*((3/5)*r-6)+6 = 0
2/3*(3/5*r-6)+6 = 0
2/3*(3/5*r-6)+6 = 0
2/5*r+2 = 0
2/5*r+2 = 0
2/5*r+2 = 0 // - 2
2/5*r = -2 // : 2/5
r = -2/2/5
r = -5
r = -5
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