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k in (-oo:+oo)
-93 = 3*k+5*k+3 // - 3*k+5*k+3
-(3*k)-(5*k)-93-3 = 0
-3*k-5*k-93-3 = 0
-8*k-96 = 0 // + 96
-8*k = 96 // : -8
k = 96/(-8)
k = -12
k = -12
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