x-y=13 x=6y-7
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x-y=13 x=6y-7
![x-y=13 x=6y-7](/uploads/image/z/4194294-6-4.jpg?t=x-y%3D13+x%3D6y-7)
将x=6y-7代入得6y-7-y=13 5y=20 y=4 x=24-7=17
x-y=13 x=6y-7
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