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b in (-oo:+oo)
(-1/7)*b+5/9 = -64/63 // + -64/63
(-1/7)*b+5/9-(-64/63) = 0
(-1/7)*b+5/9+64/63 = 0
11/7-1/7*b = 0 // - 11/7
-1/7*b = -11/7 // : -1/7
b = -11/7/(-1/7)
b = 11
b = 11
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