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7x- y =6|x3| 21x-3y=18
__________________+
20x =20
x=20:20=1
-x+3y=2
-(1)+3y=2
-1 +3y=2
3y=2+1
y =3:3=1
Jadi x=1 dan y=1
Hp{(1,1)}
jawabannya c