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vera = x - 4
jumlah umur mrk = 24
24 = togar + vera
24 = (x + x - 4)
24 = 2x - 4
24 + 4 = 2x -4+4
28 = 2x
28/2 = x
14 = x
togar = x = 14 tahun
vera = x - 4 = 14 - 4 = 10 tahun
umur Togar=x + 4
caranya:
x+x+4=24
2x=24-4
2x=20
x=20:2
x=10
jadi,umur Vera 10 tahun dan umur Togar10 + 4=14 tahun