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k in (-oo:+oo)
5*k+3/7 = -113/63 // + -113/63
5*k+3/7-(-113/63) = 0
5*k+3/7+113/63 = 0
5*k+20/9 = 0 // - 20/9
5*k = -20/9 // : 5
k = -20/9/5
k = -4/9
k = -4/9
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