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r in (-oo:+oo)
7.5*r = -31/3 // + -31/3
7.5*r-(-31/3) = 0
7.5*r+31/3 = 0
7.5*r+31/3 = 0 // - 31/3
7.5*r = -31/3 // : 7.5
r = -31/3/7.5
r = -1.37777778
r = -1.37777778
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