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f in (-oo:+oo)
7*f-(10/(-4)) = -6 // + 6
7*f-(10/(-4))+6 = 0
7*f+5/2+6 = 0
7*f+17/2 = 0 // - 17/2
7*f = -17/2 // : 7
f = -17/2/7
f = -17/14
f = -17/14
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