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b in (-oo:+oo)
4*(b+3) = 36 // - 36
4*(b+3)-36 = 0
4*(b+3)-36 = 0
4*b-24 = 0
4*b-24 = 0
4*b-24 = 0 // + 24
4*b = 24 // : 4
b = 24/4
b = 6
b = 6
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