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Champions of Equestria

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Dream Future

此问题可以转化为已知方程组求x+y+z
3x=18 ①
x/y=3 ②
z+x-y=8 ③
由①得x=6,代入②得y=2,将x,y的值代入③求出z=4,则x+y+z=6+2+4=12。