【6(x-10)-10-100】X2=x+100 【6(x-10)-10-100】X2=x+100

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【6(x-10)-10-100】X2=x+100 【6(x-10)-10-100】X2=x+100
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【6(x-10)-10-100】X2=x+100 【6(x-10)-10-100】X2=x+100
【6(x-10)-10-100】X2=x+100
【6(x-10)-10-100】X2=x+100

【6(x-10)-10-100】X2=x+100 【6(x-10)-10-100】X2=x+100

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展开【6x-60-10-100】×2=x+100
得: 【6x-170】×2=x+100
展开 12x-340=x+100
两边同减x得:11x-340=100
两边同加340得:11x=440
x=40