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k in (-oo:+oo)
3*k-(3/8) = -171/8 // + -171/8
3*k-(3/8)-(-171/8) = 0
3*k-3/8+171/8 = 0
3*k+21 = 0 // - 21
3*k = -21 // : 3
k = -21/3
k = -7
k = -7
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