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Bab Perbandingan
Matematika SMP Kelas VII

x/(x + 6) = 6/9
9x = 6(x + 6)
9x = 6x + 36
9x - 6x = 36
3x = 36
x = 36/3
x = 12

10/(10 + y) = 6/9
90 = 6 (10 + y)
90 = 60 + 6y
6y = 90 - 60
y = 30/6
y = 5

jadi, x = 12 dan y = 5