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k in (-oo:+oo)
k-7 = -4*k-67 // + -4*k-67
k-(-4*k)-7+67 = 0
k+4*k-7+67 = 0
5*k+60 = 0 // - 60
5*k = -60 // : 5
k = -60/5
k = -12
k = -12
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