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r in (-oo:+oo)
(1/(-26))*r = -66 // + 66
(1/(-26))*r+66 = 0
66-1/26*r = 0 // - 66
-1/26*r = -66 // : -1/26
r = -66/(-1/26)
r = 1716
r = 1716
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