43/140 + 41/150 = 15*43/15*140 + 14*41/14*150 = 645/2100 + 574/2100 = 645+574/2100 = 1219/2100
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43/140 + 41/150 = 15*43/15*140 + 14*41/14*150 = 645/2100 + 574/2100 = 645+574/2100 = 1219/2100