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(x/3)*10*(1/2) / 100 + (2x/3)*12*(1/2)/100 - (2x/3*10*(1/2) / 100 + x/3*12*(1/2)/100)=20
(x/3)*10*(1/2) / 100 + (2x/3)*12*(1/2)/100 - (2x/3*10*(1/2) / 100 + x/3*12*(1/2)/100)=20
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