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k in (-oo:+oo)
4*k+2 = 7*k-31 // - 7*k-31
4*k-(7*k)+2+31 = 0
4*k-7*k+2+31 = 0
33-3*k = 0 // - 33
-3*k = -33 // : -3
k = -33/(-3)
k = 11
k = 11
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