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3x - 3y = 6 ----> dikali 1
=======>>>
3x + 6y = 15
3x - 3y = 6
---------------- -
9y = 9
y = 1
========>>>
3x - 3y = 6
3x - 3 = 6
3x = 9
x = 3
=========>>>
(x,y) = (3 , 1 )
semoga membantu ^_^