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5x - 12 = 3x + 10
5x - 3x = 10 + 12
2x = 22
x =
= 11
5a - 12 = 3a +10
⇒ 5a - 3a = 10 + 12
⇒ 2a = 22
⇒ a = 11
bilangan tersebut adalah 11