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k in (-oo:+oo)
2*k+5/8 = -5/8 // + -5/8
2*k+5/8-(-5/8) = 0
2*k+5/8+5/8 = 0
2*k+5/4 = 0 // - 5/4
2*k = -5/4 // : 2
k = -5/4/2
k = -5/8
k = -5/8
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