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3x+y = 4 (x2)
------------ -
6x-3y = 18
6x+2y = 8
------------ -
-5y = 10
y= -2
*2x-y = 6
2x-(-2) = 6
2x+4 =6
2x = 2
x = 1
jadi, (x,y) adalah (1,-2)