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r in (-oo:+oo)
(-7/9)*r = 14/27 // - 14/27
(-7/9)*r-(14/27) = 0
(-7/9)*r-14/27 = 0
-7/9*r-14/27 = 0 // + 14/27
-7/9*r = 14/27 // : -7/9
r = 14/27/(-7/9)
r = -2/3
r = -2/3
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