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8a+4=5a+25
8a-5a=25-4
3a=21
a=7
di kali silang
5( a + 5 ) = 4( 2a + 1)
5a + 25 = 8a + 4 ⇒ pindah ruas
5a - 8a = 4 - 25
-3a = -21
a = -21/-3
a = 21/3
a = 7
jadi, nilai a yang memenuhi adalah 7.
semoga membantu