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k in (-oo:+oo)
4*k-(2*k)+3/4 = 91/4 // - 91/4
4*k-(2*k)+3/4-(91/4) = 0
4*k-2*k+3/4-91/4 = 0
2*k-22 = 0 // + 22
2*k = 22 // : 2
k = 22/2
k = 11
k = 11
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