5X-12=3X+12(详细点)

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5X-12=3X+12(详细点)5X-12=3X+12(详细点)5X-12=3X+12(详细点)5X-3X=12+122X=24X=125X-12=3X+125X-3X=12+122X=24X=125

5X-12=3X+12(详细点)
5X-12=3X+12(详细点)

5X-12=3X+12(详细点)
5X-3X=12+12
2X=24
X=12

5X-12=3X+12
5X-3X=12+12
2X=24
X=12

5X-12=3X+12
5X-3X=12+12
2X=24
X=12