3.6x+(3.6x-15)=486

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3.6x+(3.6x-15)=4863.6x+(3.6x-15)=4863.6x+(3.6x-15)=4863.6x+(3.6x-15)=4863.6x+3.6x-15=4867.2x=486+15=

3.6x+(3.6x-15)=486
3.6x+(3.6x-15)=486

3.6x+(3.6x-15)=486
3.6x+(3.6x-15)=486
3.6x+3.6x-15=486
7.2x=486+15=501 所以x=69.58