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答案：C
解析：
Option C is correct. To solve -3(x+3)-8=6-4x, first use the distributive property on the left side of the equation to yield -3x-9-8=6-4x. Combining like terms on both sides of the equation yields -3x-17=6-4x. Finally, isolating x on one side of the equation reveals that x=23.
