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x+2y=5
3x-y=8
>>>>>>> 3x+6y=15
3x- y =8
_________-
7y =7
y=1
karena y =1, maka x =5 ( memasukkan dalam persamaan)
x+2y=5
3x-y=8
>>>>>>> 3x+6y=15
3x- y =8
_________-
7y =7
y=1
karena y =1
3x-1=8
3x=9
x=3