Tolong dong kk..........

Tolong dong kk……….

5x° + (4x + 9)° = 180°

9x + 9° = 180°

9x = 180° – 9°

9x = 171°

x = 171/9

x = 19° $\$

5x° + ( 4x + 9 )° = 180°

5x + 4x = 180° – 9°

9x = 171°

x = 171 ÷ 9

x = 19°

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