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f in (-oo:+oo)
6-((7/9)*f) = -1 // + 1
1-((7/9)*f)+6 = 0
(-7/9)*f+1+6 = 0
7-7/9*f = 0 // - 7
-7/9*f = -7 // : -7/9
f = -7/(-7/9)
f = 9
f = 9
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