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Sagot :

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[tex]\large\boxed{x = 3}[/tex]

According to the exterior angle theorem, the angle ∠ADC is equal to the sum of ∠C and ∠B. Therefore:

120 = (15 + 5) + (22x + 4)

Combine like terms:

120 = 37x + 9

Subtract 9 from both sides:

111 = 37x

Divide both sides by 37:

x = 3.