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k in (-oo:+oo)
5*(k+10) = 80 // - 80
5*(k+10)-80 = 0
5*(k+10)-80 = 0
5*k-30 = 0
5*k-30 = 0
5*k-30 = 0 // + 30
5*k = 30 // : 5
k = 30/5
k = 6
k = 6
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