\[2x-9=9\]
1
Add 99 to both sides.
2x=9+92x=9+9

2
Simplify  9+99+9  to  1818.
2x=182x=18

3
Divide both sides by 22.
x=182x=\frac{18}{2}

4
Simplify  182\frac{18}{2}  to  99.
x=9x=9

Done

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