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b in (-oo:+oo)
5*(7*b-3) = 265 // - 265
5*(7*b-3)-265 = 0
5*(7*b-3)-265 = 0
35*b-280 = 0
35*b-280 = 0
35*b-280 = 0 // + 280
35*b = 280 // : 35
b = 280/35
b = 8
b = 8
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