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2x+5m=18-x,3x=18-5m,3x-18=-5m 5m=3(6-x) 因m為正整數,x的正整數: x=1,2,3,4,5,6,代入得m=3,12/5,9/5,6/5,3/5,0 故m為正整數3時,x=1為其解
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