Respuesta:
4x + 180 - 9x + 180 - 7x = 180
4x - 9x - 7x = 180 - 180 - 180
-12x = -180
180 = 12x
15 = x
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Respuesta:
4x + 180 - 9x + 180 - 7x = 180
4x - 9x - 7x = 180 - 180 - 180
-12x = -180
180 = 12x
15 = x