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k in (-oo:+oo)
7*k-(2*k)-(28/8) = 0
7*k-2*k-7/2 = 0
5*k-7/2 = 0 // + 7/2
5*k = 7/2 // : 5
k = 7/2/5
k = 7/10
k = 7/10
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