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b in (-oo:+oo)
-13 = -b/9 // + -b/9
-(-b/9)-13 = 0
(1/9)*b-13 = 0
1/9*b-13 = 0 // + 13
1/9*b = 13 // : 1/9
b = 13/1/9
b = 117
b = 117
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