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f in (-oo:+oo)
(-12/5)*f = -5/7 // + -5/7
(-12/5)*f-(-5/7) = 0
(-12/5)*f+5/7 = 0
5/7-12/5*f = 0 // - 5/7
-12/5*f = -5/7 // : -12/5
f = -5/7/(-12/5)
f = 25/84
f = 25/84
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