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b in (-oo:+oo)
b/5 = 7.9 // - 7.9
b/5-7.9 = 0
1/5*b-7.9 = 0 // + 7.9
1/5*b = 7.9 // : 1/5
b = 7.9/1/5
b = 39.5
b = 39.5
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