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