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r in (-oo:+oo)
(3/2)*r = -15/42 // + -15/42
(3/2)*r-(-15/42) = 0
(3/2)*r+5/14 = 0
3/2*r+5/14 = 0 // - 5/14
3/2*r = -5/14 // : 3/2
r = -5/14/3/2
r = -5/21
r = -5/21
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