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k in (-oo:+oo)
3-4*k-(5*k) = 75 // - 75
3-4*k-(5*k)-75 = 0
3-4*k-5*k-75 = 0
-9*k-72 = 0 // + 72
-9*k = 72 // : -9
k = 72/(-9)
k = -8
k = -8
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