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k in (-oo:+oo)
4*k+3/10 = -357/10 // + -357/10
4*k+3/10-(-357/10) = 0
4*k+3/10+357/10 = 0
4*k+36 = 0 // - 36
4*k = -36 // : 4
k = -36/4
k = -9
k = -9
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