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Verified answer

1)y=4-x
2x-4+x=2

y=4-x
3x=6 |÷3

y=4-x
x=2

y=4-2=2
x=2

2) y=2x+1
6x-2x-1=7

y=2x+1
4x=8 |÷4

y=2x+1
x=2

y=2×2+1=4+1=5
x=2