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k in (-oo:+oo)
k/7-(5/2) = 0
k/7-5/2 = 0
1/7*k-5/2 = 0 // + 5/2
1/7*k = 5/2 // : 1/7
k = 5/2/1/7
k = 35/2
k = 35/2
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