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b in (-oo:+oo)
b/7 = -7.9 // + 7.9
b/7+7.9 = 0
1/7*b+7.9 = 0 // - 7.9
1/7*b = -7.9 // : 1/7
b = -7.9/1/7
b = -55.30000111
b = -55.30000111
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