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b in (-oo:+oo)
6*(1*b+3) = 90 // - 90
6*(1*b+3)-90 = 0
6*(b+3)-90 = 0
6*(b+3)-90 = 0
6*b-72 = 0
6*b-72 = 0
6*b-72 = 0 // + 72
6*b = 72 // : 6
b = 72/6
b = 12
b = 12
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