5.5x-1.3x=12.6 3.85+1.5x=6.16x-0.9=4.5 4×4.5-3x=6.33．

5.5X-1.3X=12.6， 4.2X=12.6， 4.2X÷4.2=12.6÷4.2， X=3； ...

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