{-x+y=4 {3x+3y=24
-x+y=4
3x+3y=24
y=4+x
3x+3 (4+x) = 24
3x+12+3x=24
6x=12
x=2
y=4 + 2 = 6
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-x+y=4
3x+3y=24
y=4+x
3x+3 (4+x) = 24
y=4+x
3x+12+3x=24
y=4+x
6x=12
y=4+x
x=2
y=4 + 2 = 6
x=2