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f in (-oo:+oo)
(2/9)*f+1 = 15-4-1 // - 15-4-1
(2/9)*f-15+1+1+4 = 0
2/9*f-9 = 0 // + 9
2/9*f = 9 // : 2/9
f = 9/2/9
f = 81/2
f = 81/2
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