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b in (-oo:+oo)
2*(1*b+7) = 34 // - 34
2*(1*b+7)-34 = 0
2*(b+7)-34 = 0
2*(b+7)-34 = 0
2*b-20 = 0
2*b-20 = 0
2*b-20 = 0 // + 20
2*b = 20 // : 2
b = 20/2
b = 10
b = 10
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