solve simultaneous linear equation 99x+101y=499;101x+99y=501
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99x+101y=499-1
101x+99y=501-2
2-1,2x-2y=2
x-y=1-3
1+2,200x+200y=1000
x+y=5-4
3+4,2x=6
3-y=2
y=2
101x+99y=501-2
2-1,2x-2y=2
x-y=1-3
1+2,200x+200y=1000
x+y=5-4
3+4,2x=6
3-y=2
y=2
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