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k in (-oo:+oo)
2-((3/4)*k) = (1/8)*k+9 // - (1/8)*k+9
2-((3/4)*k)-((1/8)*k)-9 = 0
(-3/4)*k+(-1/8)*k-9+2 = 0
-7/8*k-7 = 0 // + 7
-7/8*k = 7 // : -7/8
k = 7/(-7/8)
k = -8
k = -8
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