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k in (-oo:+oo)
2*(-5*k-10) = 70 // - 70
2*(-5*k-10)-70 = 0
2*(-5*k-10)-70 = 0
-10*k-90 = 0
-10*k-90 = 0
-10*k-90 = 0 // + 90
-10*k = 90 // : -10
k = 90/(-10)
k = -9
k = -9
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