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f in (-oo:+oo)
(-4/(-9))*f = -3 // + 3
(-4/(-9))*f+3 = 0
4/9*f+3 = 0 // - 3
4/9*f = -3 // : 4/9
f = -3/4/9
f = -27/4
f = -27/4
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