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f in (-oo:+oo)
(2/3)*f+4 = 7/8 // - 7/8
(2/3)*f-(7/8)+4 = 0
(2/3)*f-7/8+4 = 0
2/3*f+25/8 = 0 // - 25/8
2/3*f = -25/8 // : 2/3
f = -25/8/2/3
f = -75/16
f = -75/16
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