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k in (-oo:+oo)
k+3/4 = k/3 // - k/3
k-(k/3)+3/4 = 0
2/3*k+3/4 = 0 // - 3/4
2/3*k = -3/4 // : 2/3
k = -3/4/2/3
k = -9/8
k = -9/8
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