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r in (-oo:+oo)
(-3/5)*r+6*r = (5/6)*r-(1/2) // - (5/6)*r-(1/2)
(-3/5)*r+6*r-((5/6)*r)+1/2 = 0
(-3/5)*r+6*r+(-5/6)*r+1/2 = 0
137/30*r+1/2 = 0 // - 1/2
137/30*r = -1/2 // : 137/30
r = -1/2/137/30
r = -15/137
r = -15/137
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