Respuesta :

abdulgafaryusuf9

Answer:

the negative sign before X in the bracket isn't supposed to affect the ones after the bracket

Step-by-step explanation:

(90 - x) + 2x + x = 180

90 - x + 2x + x = 180

90 + 2x = 180

sub. 90 from both sides

2x = 90

x = 45

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