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b in (-oo:+oo)
(7*b)/12 = 4.2 // - 4.2
(7*b)/12-4.2 = 0
7/12*b-4.2 = 0 // + 4.2
7/12*b = 4.2 // : 7/12
b = 4.2/7/12
b = 7.20000004
b = 7.20000004
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