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f in (-oo:+oo)
(74/5)*f-((5/6)*f) = (7/30)*f // - (7/30)*f
(74/5)*f-((5/6)*f)-((7/30)*f) = 0
(74/5)*f+(-5/6)*f+(-7/30)*f = 0
206/15*f = 0 // : 206/15
f = 0
f = 0
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