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f in (-oo:+oo)
(4/7)*f-((3/7)*f)+19+25 = 0
(-3/7)*f+(4/7)*f+19+25 = 0
1/7*f+44 = 0 // - 44
1/7*f = -44 // : 1/7
f = -44/1/7
f = -308
f = -308
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