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k in (-oo:+oo)
k/7 = 3*5 // - 3*5
k/7-(3*5) = 0
k/7-15 = 0
1/7*k-15 = 0 // + 15
1/7*k = 15 // : 1/7
k = 15/1/7
k = 105
k = 105
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