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k in (-oo:+oo)
4*k+7 = 25/3 // - 25/3
4*k-(25/3)+7 = 0
4*k-25/3+7 = 0
4*k-4/3 = 0 // + 4/3
4*k = 4/3 // : 4
k = 4/3/4
k = 1/3
k = 1/3
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