Answer:
4x+1=81(vertically opposite angles)
x=20 degrees
Step by step explanation:
4x+1=81
4x =81-1
4x=80
x=20
(4x+1)= 81
Explanation:
4x+1= 81
4x= 81 - 1
4x= 80
x= 80/4
x= 20
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