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k in (-oo:+oo)
3*k-8 = -53/10 // + -53/10
3*k-(-53/10)-8 = 0
3*k+53/10-8 = 0
3*k-27/10 = 0 // + 27/10
3*k = 27/10 // : 3
k = 27/10/3
k = 9/10
k = 9/10
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