请你阅读下列计算过程，再回答所提出的问题。=x-3-3（x+1）C=-2x-6D①上述计算过程中，从哪一步开始出现错误__________；②从B到C是否正确？_________，若不正确，错误的原因

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• 化简：-九年级数学
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