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k in (-oo:+oo)
4*(1*k+6) = 8 // - 8
4*(1*k+6)-8 = 0
4*(k+6)-8 = 0
4*(k+6)-8 = 0
4*k+16 = 0
4*k+16 = 0
4*k+16 = 0 // - 16
4*k = -16 // : 4
k = -16/4
k = -4
k = -4
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