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k in (-oo:+oo)
2-7*k = 7*k+128 // - 7*k+128
2-7*k-(7*k)-128 = 0
2-7*k-7*k-128 = 0
-14*k-126 = 0 // + 126
-14*k = 126 // : -14
k = 126/(-14)
k = -9
k = -9
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