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Simplificas
115+2β=180
Pasas al 15 del otro lado
2β=180-115
Despejas a 2
β=65/2
β=32.5°
EL otro ejercicio
α+α-50=180
Simplificas
2α-50=180
2α=180+50
2α=230
α=230/2
α=115°