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f in (-oo:+oo)
-4/7 = (-2/3)*f // - (-2/3)*f
-((-2/3)*f)-4/7 = 0
(2/3)*f-4/7 = 0
2/3*f-4/7 = 0 // + 4/7
2/3*f = 4/7 // : 2/3
f = 4/7/2/3
f = 6/7
f = 6/7
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