-1=-k-k+7

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Solution for -1=-k-k+7 equation: 


k in (-oo:+oo)

-1 = 7-k-k // - 7-k-k

k+k-7-1 = 0

2*k-8 = 0 // + 8

2*k = 8 // : 2

k = 8/2

k = 4

k = 4

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