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