((60+x)*(35/100))+(100+x)*(25/100) = 21 + 35x/100 + 25 + 25x/100 = 60x/100 + 46 = 0.6x + 46
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((60+x)*(35/100))+(100+x)*(25/100) = 21 + 35x/100 + 25 + 25x/100 = 60x/100 + 46 = 0.6x + 46
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