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去分母,得3(3-5x)- 4(5+2x)=6(1-3x)-12 去括弧,得9-15x-20-8x=6-18x-12 移項,得-15x-8x+18x=-12-9+20 合併同類項,得-5x=23 係數化為1,得x = -23/5
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