英文数学题，请大家帮忙，谢谢！
Thesumoftwonumberisatmostelevenandtheirdifferenceistwenty-one,whatatthenumbers?请大家写步骤...
The sum of two number is at most eleven and their difference is twenty-one, what at the numbers ?请大家写步骤！谢谢
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设两数为x、y，且x>y
x+y<=11
x-y=21
x=y+21
y+21+y<=11
2y<=-10
y<=-5
x<=-5+21
x<=16
x+y<=11
x-y=21
x=y+21
y+21+y<=11
2y<=-10
y<=-5
x<=-5+21
x<=16
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