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r in (-oo:+oo)
(-7/8)*r = 3/4 // - 3/4
(-7/8)*r-(3/4) = 0
(-7/8)*r-3/4 = 0
-7/8*r-3/4 = 0 // + 3/4
-7/8*r = 3/4 // : -7/8
r = 3/4/(-7/8)
r = -6/7
r = -6/7
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