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k in (-oo:+oo)
(-3/4)*k-(7*k)+1 = 137/44 // - 137/44
(-3/4)*k-(7*k)-(137/44)+1 = 0
(-3/4)*k-7*k-137/44+1 = 0
-31/4*k-93/44 = 0 // + 93/44
-31/4*k = 93/44 // : -31/4
k = 93/44/(-31/4)
k = -3/11
k = -3/11
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