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Misal
Berat badan Amir = A
Berat badan Toni = T
T = A - 3
A + T = 109
subtitusikan T = A - 3 ke A + T = 109
maka :
A + T = 109
A + A - 3 = 109
2A - 3 = 109
2A = 109 + 3
2A = 112
A = 112/2
= 56 Kg
--No 3--
A = {2, 3, 5, 7}
B = {1, 2, 5, 10}
A∩B = {2, 5}