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b in (-oo:+oo)
2*b+1 = 73-7*b // - 73-7*b
2*b-(-7*b)-73+1 = 0
2*b+7*b-73+1 = 0
9*b-72 = 0 // + 72
9*b = 72 // : 9
b = 72/9
b = 8
b = 8
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