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k in (-oo:+oo)
3*k+3*k-1 = -25/4 // + -25/4
3*k+3*k-(-25/4)-1 = 0
3*k+3*k+25/4-1 = 0
6*k+21/4 = 0 // - 21/4
6*k = -21/4 // : 6
k = -21/4/6
k = -7/8
k = -7/8
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