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r in (-oo:+oo)
(3/2)*r = -6/16 // + -6/16
(3/2)*r-(-6/16) = 0
(3/2)*r+3/8 = 0
3/2*r+3/8 = 0 // - 3/8
3/2*r = -3/8 // : 3/2
r = -3/8/3/2
r = -1/4
r = -1/4
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