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f in (-oo:+oo)
(-4/9)*f = 2/3 // - 2/3
(-4/9)*f-(2/3) = 0
(-4/9)*f-2/3 = 0
-4/9*f-2/3 = 0 // + 2/3
-4/9*f = 2/3 // : -4/9
f = 2/3/(-4/9)
f = -3/2
f = -3/2
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