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b in (-oo:+oo)
7*(5*b+4) = -287 // + 287
7*(5*b+4)+287 = 0
7*(5*b+4)+287 = 0
35*b+315 = 0
35*b+315 = 0
35*b+315 = 0 // - 315
35*b = -315 // : 35
b = -315/35
b = -9
b = -9
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