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k in (-oo:+oo)
79/10 = (6/7)*k-(5*k)+5 // - (6/7)*k-(5*k)+5
5*k-((6/7)*k)+79/10-5 = 0
(-6/7)*k+5*k+79/10-5 = 0
29/7*k+29/10 = 0 // - 29/10
29/7*k = -29/10 // : 29/7
k = -29/10/29/7
k = -7/10
k = -7/10
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