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k in (-oo:+oo)
2*(7*k+8) = 2 // - 2
2*(7*k+8)-2 = 0
2*(7*k+8)-2 = 0
14*k+14 = 0
14*k+14 = 0
14*k+14 = 0 // - 14
14*k = -14 // : 14
k = -14/14
k = -1
k = -1
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