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2+3-z = z
5-z = z
5 = 2z
z = 5/2
2 - z = z - 3
Pindahkan z yang dikanan ke kiri
2 - z - z = -3
Pindahkan 2 ke kanan
-2z = -3-2
-2z = -5
z = 5/2
z = 2,5