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Answer :

Answer is X= 23.......
Thebecksgo

Answer:

x = 23

Step-by-step explanation:

the sum of all interior angles of  triangle is 180 dehrees.

top angle = 180-100 = 80 degrees

80 + 51 + (2x+3) = 180

2x+3 = 49

2x = 46

x = 23

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