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r in (-oo:+oo)
2*r+2/3 = -(86/15) // + 86/15
2*r+2/3+86/15 = 0
2*r+32/5 = 0 // - 32/5
2*r = -32/5 // : 2
r = -32/5/2
r = -16/5
r = -16/5
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