x+y=20 3x-2y=5
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x+y=20 3x-2y=5
x+y=20
3x-2y=5
x+y=20
3x-2y=5
x+y=20
x=20-y
将x带入
3x-2y=5
3(20-y)-2y=5
60-3y-2y=5
-5y=-55
y=11
x+y=20
x+11=20
x=9
x=20-y
将x带入
3x-2y=5
3(20-y)-2y=5
60-3y-2y=5
-5y=-55
y=11
x+y=20
x+11=20
x=9
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