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k in (-oo:+oo)
((2^1)/8)*k = 7 // - 7
((2^1)/8)*k-7 = 0
(2/8)*k-7 = 0
1/4*k-7 = 0 // + 7
1/4*k = 7 // : 1/4
k = 7/1/4
k = 28
k = 28
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