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r in (-oo:+oo)
9/1 = (-3/8)*r // - (-3/8)*r
9/1-((-3/8)*r) = 0
(3/8)*r+9 = 0
3/8*r+9 = 0 // - 9
3/8*r = -9 // : 3/8
r = -9/3/8
r = -24
r = -24
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