3x-20=y x+y=180
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3x-20=y x+y=180
![3x-20=y x+y=180](/uploads/image/z/17141182-70-2.jpg?t=3x-20%3Dy+x%2By%3D180)
3x-20+x+y=y+180
4x=200
x=50
150-20=y
y=130
答:x=50,y=130
4x=200
x=50
150-20=y
y=130
答:x=50,y=130
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
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x+y=20-6 3x+y=30
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