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3a +15 = 6 x 5
3a +15 = 30
3a = 30 -15
3a = 15
a = 15/3
a = 5
Jadi, nilai a adalah 5.
Itu jawabannya.
3a = 6 - 15/5
3a = 30/5 - 15/5
3a = 15/5
3a= 3
a = 1