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Bab PerbandinganMatematika SMP Kelas VII
Dina = a
Dini = b
a = 5 + b
a - 5 = 2 (b - 5)
5 + b - 5 = 2b - 10
b = 2b - 10
10 = 2b - b
b = 10
a = 5 + b
a = 5 + 10
a = 15
jumlah umur = a + b
jumlah umur = 15 + 10
jumlah umur = 25 tahun