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k in (-oo:+oo)
(1/5)*(5*k+5) = 4 // - 4
(1/5)*(5*k+5)-4 = 0
1/5*(5*k+5)-4 = 0
1/5*(5*k+5)-4 = 0
k-3 = 0
k-3 = 0
k-3 = 0 // + 3
k = 3
k = 3
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