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k in (-oo:+oo)
7*k+4 = (3/2)*k+16 // - (3/2)*k+16
7*k-((3/2)*k)-16+4 = 0
7*k+(-3/2)*k-16+4 = 0
11/2*k-12 = 0 // + 12
11/2*k = 12 // : 11/2
k = 12/11/2
k = 24/11
k = 24/11
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