3(2x+1)≥2(4x+1)+7,化简|-x-2|-|5x+4|
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3(2x+1)≥2(4x+1)+7,化简|-x-2|-|5x+4|
3(2x+1)≥2(4x+1)+7,化简|-x-2|-|5x+4|
3(2x+1)≥2(4x+1)+7,化简|-x-2|-|5x+4|
3(2x+1)≥2(4x+1)+7,
6x+3>=8x+9
2x
求出x的范围,再化简
因为3(2x+1)≥2(4x+1)+7
所以6x+3≥8x+9,化简得2x≤-6,x≤-3
所以-x≥3,-x-2≥1,5x+4≤0
|-x-2|-|5x+4|=-x-2+5x+4=4x+2
4x 2
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