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