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b in (-oo:+oo)
5*b-((12*b)/2)+30 = 3 // - 3
5*b-((12*b)/2)-3+30 = 0
5*b-6*b-3+30 = 0
27-b = 0 // - 27
-b = -27 // * -1
b = 27
b = 27
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