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b in (-oo:+oo)
6*(4*b+7) = 90 // - 90
6*(4*b+7)-90 = 0
6*(4*b+7)-90 = 0
24*b-48 = 0
24*b-48 = 0
24*b-48 = 0 // + 48
24*b = 48 // : 24
b = 48/24
b = 2
b = 2
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