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k in (-oo:+oo)
33 = 3*k+2*k-7 // - 3*k+2*k-7
7-(3*k)-(2*k)+33 = 0
7-3*k-2*k+33 = 0
40-5*k = 0 // - 40
-5*k = -40 // : -5
k = -40/(-5)
k = 8
k = 8
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