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k in (-oo:+oo)
3*k-2*k+3/4 = -13/4 // + -13/4
3*k-2*k+3/4-(-13/4) = 0
3*k-2*k+3/4+13/4 = 0
k+4 = 0 // - 4
k = -4
k = -4
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