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f in (-oo:+oo)
(-5/6)*f = 7/8 // - 7/8
(-5/6)*f-(7/8) = 0
(-5/6)*f-7/8 = 0
-5/6*f-7/8 = 0 // + 7/8
-5/6*f = 7/8 // : -5/6
f = 7/8/(-5/6)
f = -21/20
f = -21/20
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