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f in (-oo:+oo)
45 = (5/9)*f // - (5/9)*f
45-((5/9)*f) = 0
(-5/9)*f+45 = 0
45-5/9*f = 0 // - 45
-5/9*f = -45 // : -5/9
f = -45/(-5/9)
f = 81
f = 81
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