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b in (-oo:+oo)
5*b-7 = 20-4*b // - 20-4*b
5*b-(-4*b)-20-7 = 0
5*b+4*b-20-7 = 0
9*b-27 = 0 // + 27
9*b = 27 // : 9
b = 27/9
b = 3
b = 3
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