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k in (-oo:+oo)
7*k-(2*k)+8 = -32 // + 32
7*k-(2*k)+8+32 = 0
7*k-2*k+8+32 = 0
5*k+40 = 0 // - 40
5*k = -40 // : 5
k = -40/5
k = -8
k = -8
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