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Let x = number of history textbooks sold
x - 54 = number of physics textbooks sold
Total textbooks sold:
x + (x - 54) = 308
2x - 54 = 308
2x = 362
x = 181
Number of history textbooks sold: 181
Number of physics textbooks sold: 181 - 54 = 127
Thus, 181 history textbooks and 127 physics textbooks were sold.