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a) y-x =4
3 (x +y)= 24
y-x=4*3
3x+3y=24
3y-3x=12
3x+3y=24
6y=36/6
y=6
3y-3x=12
18-3x=12
-3x=12-18
-3x=-6/(-3)
x=2