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f in (-oo:+oo)
2/3 = (4*f)/6 // - (4*f)/6
2/3-((4*f)/6) = 0
(-2/3)*f+2/3 = 0
2/3-2/3*f = 0 // - 2/3
-2/3*f = -2/3 // : -2/3
f = -2/3/(-2/3)
f = 1
f = 1
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