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f in (-oo:+oo)
5/6-(2*f)+3 = 3-(f/4) // - 3-(f/4)
f/4-(2*f)+5/6-3+3 = 0
f/4-2*f+5/6-3+3 = 0
5/6-7/4*f = 0 // - 5/6
-7/4*f = -5/6 // : -7/4
f = -5/6/(-7/4)
f = 10/21
f = 10/21
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