Solve and check.
2x-1=9

“Solution =5

Add
1
1
1
to both sides of the equation
2

−
1
=
9
2
x
−
1
=
9
2x−1=9
2

−
1
+
1
=
9
+
1
2
x
−
1
+
1
=
9
+
1
2x−1+1=9+1
2
Simplify
Add the numbers
Add the numbers
again
2

=
1
0
2
x
=
10
2x=10
3
Divide both sides of the equation by the same term
2

=
1
0
2
x
=
10
2x=10
2

2
=
1
0
2
2
x
2
=
10
2
22x=210
4
Simplify
Cancel terms that are in both the numerator and denominator
Divide the numbers”
Hope this helps.

Agc and bgd are vertical angles

Im pretty sure it’s the first one