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-z-z = - 3 - 2
-2z = -6
z = -6/-2
Jadi z = 3
3a-2 = a+ 18
3a-a = 18+2
2a = 20
a = 20/2
a = 10
Jadi a = 10
2a-1 = 3a-5
2a-3a = -5+1
-a = -4 ---> kedua rua kalikan -1
a = 4
Jadi a = 4