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k in (-oo:+oo)
(-1/5)*k-((6/7)*k)+1 = -30/7 // + -30/7
(-1/5)*k-((6/7)*k)-(-30/7)+1 = 0
(-1/5)*k+(-6/7)*k+30/7+1 = 0
37/7-37/35*k = 0 // - 37/7
-37/35*k = -37/7 // : -37/35
k = -37/7/(-37/35)
k = 5
k = 5
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