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k in (-oo:+oo)
(7*k)/8-((15*k)/16)-(3/4)-(3/8) = 0
(7*k)/8+(-15/16)*k-3/4-3/8 = 0
-1/16*k-9/8 = 0 // + 9/8
-1/16*k = 9/8 // : -1/16
k = 9/8/(-1/16)
k = -18
k = -18
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