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k in (-oo:+oo)
7-2*k = 3*k+32 // - 3*k+32
7-2*k-(3*k)-32 = 0
7-2*k-3*k-32 = 0
-5*k-25 = 0 // + 25
-5*k = 25 // : -5
k = 25/(-5)
k = -5
k = -5
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