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k in (-oo:+oo)
6*k-4 = -2*k-100 // + -2*k-100
6*k-(-2*k)-4+100 = 0
6*k+2*k-4+100 = 0
8*k+96 = 0 // - 96
8*k = -96 // : 8
k = -96/8
k = -12
k = -12
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