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b in (-oo:+oo)
7*b+9 = 5*b+31 // - 5*b+31
7*b-(5*b)-31+9 = 0
7*b-5*b-31+9 = 0
2*b-22 = 0 // + 22
2*b = 22 // : 2
b = 22/2
b = 11
b = 11
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