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b in (-oo:+oo)
7*b+(4/7)*b+2/9 = 173/63 // - 173/63
7*b+(4/7)*b+2/9-(173/63) = 0
7*b+(4/7)*b+2/9-173/63 = 0
53/7*b-53/21 = 0 // + 53/21
53/7*b = 53/21 // : 53/7
b = 53/21/53/7
b = 1/3
b = 1/3
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