3乘[7-(x-y)]=10. 4x-3(x+y+

3乘[7-(x-y)]=10. 4x-3(x+y+1)=10 解方程

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解由3×[7-(x-y)]=10得3x-3y=11.......①
由4x-3(x+y+1)=10得x-3y=13........②
由①②联立
解得x=-1，y=-14/3