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f in (-oo:+oo)
(-22/5)*f = -31/5 // + -31/5
(-22/5)*f-(-31/5) = 0
(-22/5)*f+31/5 = 0
31/5-22/5*f = 0 // - 31/5
-22/5*f = -31/5 // : -22/5
f = -31/5/(-22/5)
f = 31/22
f = 31/22
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