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3y + 2x = 12 Ix4I= 12x + 8y=48
____________+
22x=88
x= 88/22 =4
jadi, 3y + 2x=12
3y+2(4)=12
3y=12-8
y=4/3= 1,3 jadi himpunannya =(4 dan 1,3)