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