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