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saya = s
a-5=3(s - 5)
a-5=3s-15
a = 3s - 10
a + 10 = 2(s+10)
a+10 = 2s + 20
a = 2s + 10
3s - 10 = 2s + 10
s = 20 thn
a = 3 x 20 -10 = 60 - 10 = 50 thn