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a=b*c+(b*d/4)*a-(b*d/4)*e,e=b*c+(3*b*d/12)*a+(5*b*d/12)*e solve for a,e
a=b*c+(b*d/4)*a-(b*d/4)*e,e=b*c+(3*b*d/12)*a+(5*b*d/12)*e solve for a,e
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