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f in (-oo:+oo)
5 = (3*f)/6-8 // - (3*f)/6-8
5-((3*f)/6)+8 = 0
(-1/2)*f+5+8 = 0
13-1/2*f = 0 // - 13
-1/2*f = -13 // : -1/2
f = -13/(-1/2)
f = 26
f = 26
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