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r in (-oo:+oo)
8/9 = 2*r-(3/4) // - 2*r-(3/4)
8/9-(2*r)+3/4 = 0
8/9-2*r+3/4 = 0
59/36-2*r = 0 // - 59/36
-2*r = -59/36 // : -2
r = -59/36/(-2)
r = 59/72
r = 59/72
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