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f in (-oo:+oo)
(4/5)*f = 2/3 // - 2/3
(4/5)*f-(2/3) = 0
(4/5)*f-2/3 = 0
4/5*f-2/3 = 0 // + 2/3
4/5*f = 2/3 // : 4/5
f = 2/3/4/5
f = 5/6
f = 5/6
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