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k in (-oo:+oo)
-3*k-(5*k)-(3/4) = -323/4 // + -323/4
-3*k-(5*k)-(3/4)-(-323/4) = 0
323/4-3*k-5*k-3/4 = 0
80-8*k = 0 // - 80
-8*k = -80 // : -8
k = -80/(-8)
k = 10
k = 10
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