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x = 200-100 = 100
y-100 = -100
y = 0
-1200+z = -1500
z = -1500+1200 = -300
x=200-100
x=100
y-100=-100
y=-100+100
y=0
-1200+z=-1500
z=-1500+1200
z=-300
ket
,jika disebelah kiri (+) di kanan kan berati jadi (-),karena pindah ruas.
:)