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4a+12-5 = 3a+18
4a+7 = 3a+18
4a-3a = 18-7
a=11
a-4 = 11-4 = 7
4a + 12 - 5 = 3a + 18
4a + 7 = 3a + 18
4a - 3a = 18 - 7
a = 11
jadi
a - 4 = 11 - 4
= 7