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