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b in (-oo:+oo)
4*b = 7/2 // - 7/2
4*b-(7/2) = 0
4*b-7/2 = 0
4*b-7/2 = 0 // + 7/2
4*b = 7/2 // : 4
b = 7/2/4
b = 7/8
b = 7/8
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