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2(-4-2y) +z = 5
-8-4y+z =5
-4y + z =13
y-3z = -6 (kalikan 4) menjadi 4y -12z = -24
4y-12z =24
-4y+z =13
-11z = 11 ; z = -1
y = -6+3z = -9
x = -4-2y = 14