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y + 2x = 8 (kali 2) 2y + 4x = 16
2y - 7x = -6 (kali 1) 2y - 7x = -6
terus di kurangi jadi 11x = 22 maka x = 2
nyari Y
y+2x = 8
y= 8 - 2x
y= 8 - 2(2)
y = 8- 4 = 4