180-(180-(90-(180-α)))=25
180-(180-(90-180+α))=25
180-(180-(-90+α))=25
180-(180+90-α)=25
180-180-90+α=25
α-90=25
α=115
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180-(180-(90-(180-α)))=25
180-(180-(90-180+α))=25
180-(180-(-90+α))=25
180-(180+90-α)=25
180-180-90+α=25
α-90=25
α=115