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