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f in (-oo:+oo)
5/6 = (1/2)*((1/4)*f-(2/3)) // - (1/2)*((1/4)*f-(2/3))
5/6-((1/2)*((1/4)*f-(2/3))) = 0
(-1/2)*((1/4)*f-2/3)+5/6 = 0
5/6-1/2*(1/4*f-2/3) = 0
(-1/2*6*(1/4*f-2/3))/6+5/6 = 0
5-1/2*6*(1/4*f-2/3) = 0
7-3/4*f = 0
(7-3/4*f)/6 = 0
(7-3/4*f)/6 = 0 // * 6
7-3/4*f = 0
7-3/4*f = 0 // - 7
-3/4*f = -7 // : -3/4
f = -7/(-3/4)
f = 28/3
f = 28/3
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