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3(180 - x - 90 - x) = 2(180 - 90 - x)
3[90 -2x) = 2(90 - x)
270 - 6x = 180 - 2x
270 - 180 = - 2x + 6x
90 = 4x
90 ÷ 4 = x
90/4 = x
22.5 = x
RESPUESTA:
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x = 22.5° = 22° 30'
Espero que te ayude.
Saludos!!!