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k in (-oo:+oo)
90 = 5*k+5*k-10 // - 5*k+5*k-10
10-(5*k)-(5*k)+90 = 0
10-5*k-5*k+90 = 0
100-10*k = 0 // - 100
-10*k = -100 // : -10
k = -100/(-10)
k = 10
k = 10
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