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b in (-oo:+oo)
(4/5)*b+6 = 9/10 // - 9/10
(4/5)*b-(9/10)+6 = 0
(4/5)*b-9/10+6 = 0
4/5*b+51/10 = 0 // - 51/10
4/5*b = -51/10 // : 4/5
b = -51/10/4/5
b = -51/8
b = -51/8
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