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k in (-oo:+oo)
(6/7)*k-10 = -454/49 // + -454/49
(6/7)*k-(-454/49)-10 = 0
(6/7)*k+454/49-10 = 0
6/7*k-36/49 = 0 // + 36/49
6/7*k = 36/49 // : 6/7
k = 36/49/6/7
k = 6/7
k = 6/7
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