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k in (-oo:+oo)
52 = k-6*k+7 // - k-6*k+7
52-(-6*k)-k-7 = 0
6*k-k-7+52 = 0
5*k+45 = 0 // - 45
5*k = -45 // : 5
k = -45/5
k = -9
k = -9
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