help me!

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helpme!helpme! helpme!设原角为x°(180-x)+10=3(90-x)190-x=270-3x2x=80x=40

help me!
help me!
 

help me!
设原角为x°
(180-x)+10=3(90-x)
190-x=270-3x
2x=80
x=40