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k in (-oo:+oo)
-5 = 2*k-7*k+10 // - 2*k-7*k+10
-(-7*k)-(2*k)-10-5 = 0
7*k-2*k-10-5 = 0
5*k-15 = 0 // + 15
5*k = 15 // : 5
k = 15/5
k = 3
k = 3
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