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19-10-2021
Mathematics

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19-10-2021

Answer:

x = 19

Step-by-step explanation:

The sum of the three angles is 180°

So,

(5x + 4) + (x - 2) + (3x + 7) = 180

9x + 9 = 180

9x = 180-9

9x = 171

x= 171 ÷ 9

x = 19

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