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b in (-oo:+oo)
-4/5 = (-2/3)*b // - (-2/3)*b
-((-2/3)*b)-4/5 = 0
(2/3)*b-4/5 = 0
2/3*b-4/5 = 0 // + 4/5
2/3*b = 4/5 // : 2/3
b = 4/5/2/3
b = 6/5
b = 6/5
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