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b in (-oo:+oo)
(3*b)/4-(3/7) = 81/7 // - 81/7
(3*b)/4-(3/7)-(81/7) = 0
(3*b)/4-3/7-81/7 = 0
3/4*b-12 = 0 // + 12
3/4*b = 12 // : 3/4
b = 12/3/4
b = 16
b = 16
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