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b in (-oo:+oo)
b/4 = 2.6 // - 2.6
b/4-2.6 = 0
1/4*b-2.6 = 0 // + 2.6
1/4*b = 2.6 // : 1/4
b = 2.6/1/4
b = 10.4
b = 10.4
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