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k in (-oo:+oo)
3*k-9 = -87/10 // + -87/10
3*k-(-87/10)-9 = 0
3*k+87/10-9 = 0
3*k-3/10 = 0 // + 3/10
3*k = 3/10 // : 3
k = 3/10/3
k = 1/10
k = 1/10
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