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k in (-oo:+oo)
k+7 = 43-3*k // - 43-3*k
k-(-3*k)-43+7 = 0
k+3*k-43+7 = 0
4*k-36 = 0 // + 36
4*k = 36 // : 4
k = 36/4
k = 9
k = 9
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