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f in (-oo:+oo)
(1/2)*e = (1/2)*f // - (1/2)*f
(1/2)*e-((1/2)*f) = 0
(-1/2)*f+(1/2)*e = 0
1/2*e-1/2*f = 0 // - 1/2*e
-1/2*f = -(1/2*e) // : -1/2
f = (-(1/2*e))/(-1/2)
f = e
f = e
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