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k in (-oo:+oo)
1-(2*k) = -3/4 // + -3/4
1-(2*k)-(-3/4) = 0
3/4-2*k+1 = 0
7/4-2*k = 0 // - 7/4
-2*k = -7/4 // : -2
k = -7/4/(-2)
k = 7/8
k = 7/8
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