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f in (-oo:+oo)
(2/3)*f-f = -20 // + 20
(2/3)*f-f+20 = 0
20-1/3*f = 0 // - 20
-1/3*f = -20 // : -1/3
f = -20/(-1/3)
f = 60
f = 60
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