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k in (-oo:+oo)
29 = 4*k-(7*k)+8 // - 4*k-(7*k)+8
7*k-(4*k)-8+29 = 0
7*k-4*k-8+29 = 0
3*k+21 = 0 // - 21
3*k = -21 // : 3
k = -21/3
k = -7
k = -7
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