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3x+4y = 23 | .1
------------------------
10x+4y = 30
3x+4y = 23
------------------- kurang
7x = 7
x = 1
subitusikan x
5x+2y = 15
5(1)+2y = 15
2y = 15 - 5
2y = 10
y = 5
nilai x + y = 1 + 5 = 6