\[6x-9=9\]
1
Add 99 to both sides.
6x=9+96x=9+9

2
Simplify  9+99+9  to  1818.
6x=186x=18

3
Divide both sides by 66.
x=186x=\frac{18}{6}

4
Simplify  186\frac{18}{6}  to  33.
x=3x=3

Done

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