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k in (-oo:+oo)
2*k+3/10 = -157/10 // + -157/10
2*k+3/10-(-157/10) = 0
2*k+3/10+157/10 = 0
2*k+16 = 0 // - 16
2*k = -16 // : 2
k = -16/2
k = -8
k = -8
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