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b in (-oo:+oo)
b/4 = 3.4 // - 3.4
b/4-3.4 = 0
1/4*b-3.4 = 0 // + 3.4
1/4*b = 3.4 // : 1/4
b = 3.4/1/4
b = 13.6
b = 13.6
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