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b in (-oo:+oo)
4*(b-3) = 20 // - 20
4*(b-3)-20 = 0
4*(b-3)-20 = 0
4*b-32 = 0
4*b-32 = 0
4*b-32 = 0 // + 32
4*b = 32 // : 4
b = 32/4
b = 8
b = 8
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