6k+9+7k=87

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Solution for 6k+9+7k=87 equation: 


k in (-oo:+oo)

6*k+7*k+9 = 87 // - 87

6*k+7*k-87+9 = 0

13*k-78 = 0 // + 78

13*k = 78 // : 13

k = 78/13

k = 6

k = 6

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