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k in (-oo:+oo)
635/77 = (4/7)*k-(7*k)+10 // - (4/7)*k-(7*k)+10
7*k-((4/7)*k)+635/77-10 = 0
(-4/7)*k+7*k+635/77-10 = 0
45/7*k-135/77 = 0 // + 135/77
45/7*k = 135/77 // : 45/7
k = 135/77/45/7
k = 3/11
k = 3/11
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