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r in (-oo:+oo)
-28 = r/7-26 // - r/7-26
26-(r/7)-28 = 0
-1/7*r-2 = 0 // + 2
-1/7*r = 2 // : -1/7
r = 2/(-1/7)
r = -14
r = -14
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