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b in (-oo:+oo)
4*((b^1)/2) = 40 // - 40
4*((b^1)/2)-40 = 0
4*(b/2)-40 = 0
2*b-40 = 0 // + 40
2*b = 40 // : 2
b = 40/2
b = 20
b = 20
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