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b in (-oo:+oo)
7*b-2*b+7/10 = 157/10 // - 157/10
7*b-2*b+7/10-(157/10) = 0
7*b-2*b+7/10-157/10 = 0
5*b-15 = 0 // + 15
5*b = 15 // : 5
b = 15/5
b = 3
b = 3
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