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b in (-oo:+oo)
(-2/7)*b+6 = 388/63 // - 388/63
(-2/7)*b-(388/63)+6 = 0
(-2/7)*b-388/63+6 = 0
-2/7*b-10/63 = 0 // + 10/63
-2/7*b = 10/63 // : -2/7
b = 10/63/(-2/7)
b = -5/9
b = -5/9
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