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b in (-oo:+oo)
2*(5*b-8) = 14 // - 14
2*(5*b-8)-14 = 0
2*(5*b-8)-14 = 0
10*b-30 = 0
10*b-30 = 0
10*b-30 = 0 // + 30
10*b = 30 // : 10
b = 30/10
b = 3
b = 3
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