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k in (-oo:+oo)
29 = 3*k-5*k+7 // - 3*k-5*k+7
29-(-5*k)-(3*k)-7 = 0
5*k-3*k-7+29 = 0
2*k+22 = 0 // - 22
2*k = -22 // : 2
k = -22/2
k = -11
k = -11
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