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2x+3y=6
(3x-2y)+(2x+3y)=6+6
3x-2y+2x+3y=12
3x+2x-2y+3y=12
5x+y=12 -12
-7x-11y=0
-7x=11y
2x+3y=6.. ×3
____________
6x-4y=12
6x+9y=18
____________-
-13y=-6
y=6/13
maka nilai a=13(6/13)
a=6
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