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b in (-oo:+oo)
(-10/11)*b = -10/99 // + -10/99
(-10/11)*b-(-10/99) = 0
(-10/11)*b+10/99 = 0
10/99-10/11*b = 0 // - 10/99
-10/11*b = -10/99 // : -10/11
b = -10/99/(-10/11)
b = 1/9
b = 1/9
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