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f in (-oo:+oo)
12 = (7/4)*f-2 // - (7/4)*f-2
2-((7/4)*f)+12 = 0
(-7/4)*f+2+12 = 0
14-7/4*f = 0 // - 14
-7/4*f = -14 // : -7/4
f = -14/(-7/4)
f = 8
f = 8
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