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k in (-oo:+oo)
63 = 3-5*k-(7*k) // - 3-5*k-(7*k)
7*k-(-5*k)-3+63 = 0
5*k+7*k-3+63 = 0
12*k+60 = 0 // - 60
12*k = -60 // : 12
k = -60/12
k = -5
k = -5
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