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a ⇒ 4a + 8 = 12
4a + 8 - 8 = 12 - 8
4a = 4
a = 4/4
a = 1
jadi a = 1
2. 2c - 10 = 20
c ⇒ 2c - 10 = 20
2c - 10 + 10 = 20 + 10
2c = 30
c = 30/2
c = 15
jadi c = 15