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k in (-oo:+oo)
(7*k)/2-(4*k)-2 = (3*k)/2-3 // - (3*k)/2-3
(7*k)/2-(4*k)-((3*k)/2)-2+3 = 0
(7*k)/2-4*k+(-3/2)*k-2+3 = 0
1-2*k = 0 // - 1
-2*k = -1 // : -2
k = -1/(-2)
k = 1/2
k = 1/2
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