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b in (-oo:+oo)
(4/7)*b-3 = 12 // - 12
(4/7)*b-12-3 = 0
4/7*b-15 = 0 // + 15
4/7*b = 15 // : 4/7
b = 15/4/7
b = 105/4
b = 105/4
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