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题目来源：
OG详解-OG4 数学2 Q3
正确答案：C
题目详解
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Choice C is correct. The given expression shows subtraction of two like terms. The two terms can be subtracted as follows: 12x3 -5x3 =(12-5)x3, or 7x3.
Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect. This is the result of adding, not subtracting, the two like terms. Choice D is incorrect and may result from conceptual or calculation errors.
Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect. This is the result of adding, not subtracting, the two like terms. Choice D is incorrect and may result from conceptual or calculation errors.
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