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f in (-oo:+oo)
(1/2)*(f+108) = 73 // - 73
(1/2)*(f+108)-73 = 0
1/2*(f+108)-73 = 0
1/2*(f+108)-73 = 0
1/2*f-19 = 0
1/2*f-19 = 0
1/2*f-19 = 0 // + 19
1/2*f = 19 // : 1/2
f = 19/1/2
f = 38
f = 38
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