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k in (-oo:+oo)
5*k+10 = 2*k+40 // - 2*k+40
5*k-(2*k)-40+10 = 0
5*k-2*k-40+10 = 0
3*k-30 = 0 // + 30
3*k = 30 // : 3
k = 30/3
k = 10
k = 10
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