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I=6A-10....(1)
I+18=2(A+18)
I=2A+18.....(2)
aubstitusi (1) dan (2)
6A-10=2A+18
4A=28
A=7 th
I= 32 th
umur arsya = A
I+2 = 6(A+2)
I+2 = 6A+12
I = 6A+10.....[1]
I+18 = 2(A+18)
I+18 = 2A+36
subs [1] didapat
6A+10+18 = 2A+36
6A-2A = 36-28
4A = 8
A = 2
I = 6A+10
I = 6(2) +`10 = 12+10 = 22
jadi, umur ibu 22 tahun dan aesya 2 tahun