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b in (-oo:+oo)
2*(7*b-8) = 12 // - 12
2*(7*b-8)-12 = 0
2*(7*b-8)-12 = 0
14*b-28 = 0
14*b-28 = 0
14*b-28 = 0 // + 28
14*b = 28 // : 14
b = 28/14
b = 2
b = 2
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