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b in (-oo:+oo)
b/4 = 5/2 // - 5/2
b/4-(5/2) = 0
b/4-5/2 = 0
1/4*b-5/2 = 0 // + 5/2
1/4*b = 5/2 // : 1/4
b = 5/2/1/4
b = 10
b = 10
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