4+7k+4k=81

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Solution for 4+7k+4k=81 equation: 


k in (-oo:+oo)

7*k+4*k+4 = 81 // - 81

7*k+4*k-81+4 = 0

11*k-77 = 0 // + 77

11*k = 77 // : 11

k = 77/11

k = 7

k = 7

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