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4x - 2y = 16
x - 3y = 9......kali 4
4x - 2y = 16
4x -12y = 36 ....(-)
10y = - 20
y = - 2
x = 9 + 3y
x = 9 + 3(-2)
x= 3
(x,y)= (3, -2)