2X+1.5X=17.5解:8X-3X=105解:3X+X+6=26解:
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2X+1.5X=17.5解:8X-3X=105解:3X+X+6=26解:
2X+1.5X=17.5解:8X-3X=105解:3X+X+6=26解:
2X+1.5X=17.5解:8X-3X=105解:3X+X+6=26解: