0.8x+0.4x=1.2 32x-9x-13x=60 0.7x+4=1027 x-3×9=8 15x-7.5x=15 x-0.8x+0.7x=8.1．

（1）0.8x+0.4x=1.2， 1.2x=1.2， 1.2x÷1.2=1.2÷1.2， &nbs...

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