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