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b in (-oo:+oo)
99.1 = b/7 // - b/7
99.1-(b/7) = 0
99.1-1/7*b = 0 // - 99.1
-1/7*b = -99.1 // : -1/7
b = -99.1/(-1/7)
b = 693.70001387
b = 693.70001387
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