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f in (-oo:+oo)
(4*f-6)/4 = 1 // - 1
(4*f-6)/4-1 = 0
(4*f-6)/4+(-1*4)/4 = 0
4*f-1*4-6 = 0
4*f-10 = 0
(4*f-10)/4 = 0
(4*f-10)/4 = 0 // * 4
4*f-10 = 0
4*f-10 = 0 // + 10
4*f = 10 // : 4
f = 10/4
f = 5/2
f = 5/2
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