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a² = 100/4
a² = 25
a = √25
a = 5 atau a = - 5
4√a = 12
√a = 12/4
√a = 3 ...... kedua ruas pangkatkan 2
a = 3²
a = 9
1/4 a - 2/3 a = - 5 ...... kalikan dengan 12
3a - 8a = - 60
- 5a = - 60
a = - 60 / - 5
a = 12