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k in (-oo:+oo)
(7/9)*k = -7/9 // + -7/9
(7/9)*k-(-7/9) = 0
(7/9)*k+7/9 = 0
7/9*k+7/9 = 0 // - 7/9
7/9*k = -7/9 // : 7/9
k = -7/9/7/9
k = -1
k = -1
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