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