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ifa = x
a) umur ida = 5 + x
b) jumlah umur mereka = 5 + x + x
= 5 + 2x
c) umur ifa 4 tahun lagi
= 4 + x
maksudnya gitu bukan?.__.
Ida > Ifa
Maka
A. Ida = x + 5
B. Ida + Ifa = x + 5 + x
= 2x + 5
C. Ifa + 4 = x + 4
smgmbntuya kalau boleh jadikan terbaik ya^^