Question

12.- Calcula >, si AB=BC
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Answer 1

40 + 2(x + 20)= 180
2(x + 20) = 180 - 40
2(x + 20) = 140
x + 20 = 140/2
x + 20 = 70
x = 70 - 20
x = 50

Espero q te ayude :)