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x + y = 4
x - 2y= -2
________ -
3y =6
y = 6/3
y = 2
x - 2y = -2
x -2(2) = -2
x - 4 = -2
x = -2+4
x= 2
jadi nilai 2x+4y =2(2) + 4(2)
= 4 + 8
= 12