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k in (-oo:+oo)
5*(1*k+6) = 40 // - 40
5*(1*k+6)-40 = 0
5*(k+6)-40 = 0
5*(k+6)-40 = 0
5*k-10 = 0
5*k-10 = 0
5*k-10 = 0 // + 10
5*k = 10 // : 5
k = 10/5
k = 2
k = 2
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