2x-4+6x-3=9x+9
9x-2x-6x=-4-3-9
x=-16
2（x-2）+3(2x-1)=9(x+1)
2（x-2）+3(2x-1)=9(x+1)
數(shù)學人氣：531 ℃時間：2020-06-14 14:33:07
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