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ángulo B
A + B = 180
2B + 45 = A
A = 2B + 45
A + B = 180
2B + 45 + B = 180
3B = 135
B = 45
A = 2B + 45
A = 2(45) + 45
A = 3(45)
A = 135
Ángulo A = 135
ángulo B = 45