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f in (-oo:+oo)
f/(-18) = 6/(-12) // - 6/(-12)
f/(-18)-(6/(-12)) = 0
f/(-18)+1/2 = 0
1/2-1/18*f = 0 // - 1/2
-1/18*f = -1/2 // : -1/18
f = -1/2/(-1/18)
f = 9
f = 9
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