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b in (-oo:+oo)
2*b+1 = 71-5*b // - 71-5*b
2*b-(-5*b)-71+1 = 0
2*b+5*b-71+1 = 0
7*b-70 = 0 // + 70
7*b = 70 // : 7
b = 70/7
b = 10
b = 10
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