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k in (-oo:+oo)
4-(7*k) = 4*k-128 // - 4*k-128
4-(7*k)-(4*k)+128 = 0
4-7*k-4*k+128 = 0
132-11*k = 0 // - 132
-11*k = -132 // : -11
k = -132/(-11)
k = 12
k = 12
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