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3(2)+x=320
x=320-6
x=314
Complemento del angulo C(x)=90°-x
Suplemento del angulo S(x)=180°-x
entonces
3S(x)-2C(x)=320°
3(180°-x)-2(90°-x)=320°
540°-3x-180°+2x=320°
540°-3x-180°+2x=320°
360°-x=320°
-x=-40°
x=40°