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k in (-oo:+oo)
7*k+3/4 = 143/4 // - 143/4
7*k+3/4-(143/4) = 0
7*k+3/4-143/4 = 0
7*k-35 = 0 // + 35
7*k = 35 // : 7
k = 35/7
k = 5
k = 5
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