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k in (-oo:+oo)
4*k+7 = 7*k+13 // - 7*k+13
4*k-(7*k)-13+7 = 0
4*k-7*k-13+7 = 0
-3*k-6 = 0 // + 6
-3*k = 6 // : -3
k = 6/(-3)
k = -2
k = -2
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