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x-4
y-4
x+y=28
x-4=(y-4)
x+y=28
3x-12=y-4
x+y=28
y=3x-8
x+3x-8=28
y=3x-8
4x=36
y=3x-8
x=9
y=3*9-8
x=9
y=27-8
x=9
y=19