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k in (-oo:+oo)
3*(5*k-4) = 123 // - 123
3*(5*k-4)-123 = 0
3*(5*k-4)-123 = 0
15*k-135 = 0
15*k-135 = 0
15*k-135 = 0 // + 135
15*k = 135 // : 15
k = 135/15
k = 9
k = 9
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