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f in (-oo:+oo)
(2/3)*f+6 = f/4-2 // - f/4-2
(2/3)*f-(f/4)+2+6 = 0
5/12*f+8 = 0 // - 8
5/12*f = -8 // : 5/12
f = -8/5/12
f = -96/5
f = -96/5
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