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y - wiek Michała
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y + (-y) = 7x - 12 - 4x
0 = 3x - 12
12 = 3x
x = 4
y = 4x
y = 4 * 4 = 16
i dla sprawdzenia:
y - 2 = 7(x - 2)
16 - 2 = 7 * 4 - 14
14 = 28 - 14
14 = 14
Ola ma 4 lata, a Michał 16.