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k in (-oo:+oo)
5*(6*k-4) = 70 // - 70
5*(6*k-4)-70 = 0
5*(6*k-4)-70 = 0
30*k-90 = 0
30*k-90 = 0
30*k-90 = 0 // + 90
30*k = 90 // : 30
k = 90/30
k = 3
k = 3
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