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r in (-oo:+oo)
r/4 = r+3/6 // - r+3/6
r/4-r-(3/6) = 0
r/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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