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f in (-oo:+oo)
f/3+4/e = 5 // - 5
f/3+4/e-5 = 0
1/3*f+4/e-5 = 0 // - 4/e-5
1/3*f = -(4/e-5) // : 1/3
f = (-(4/e-5))/1/3
f = 3*(5-(4/e))
f = 3*(5-(4/e))
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