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k in (-oo:+oo)
4*k+7 = 2*k+9 // - 2*k+9
4*k-(2*k)-9+7 = 0
4*k-2*k-9+7 = 0
2*k-2 = 0 // + 2
2*k = 2 // : 2
k = 2/2
k = 1
k = 1
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