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k in (-oo:+oo)
(1/7)*(2*k-3) = -5 // + 5
(1/7)*(2*k-3)+5 = 0
1/7*(2*k-3)+5 = 0
1/7*(2*k-3)+5 = 0
2/7*k+32/7 = 0
2/7*k+32/7 = 0
2/7*k+32/7 = 0 // - 32/7
2/7*k = -32/7 // : 2/7
k = -32/7/2/7
k = -16
k = -16
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