3x9=93x-9=9

1
Add 99 to both sides.
3x=9+93x=9+9

2
Simplify  9+99+9  to  1818.
3x=183x=18

3
Divide both sides by 33.
x=183x=\frac{18}{3}

4
Simplify  183\frac{18}{3}  to  66.
x=6x=6

Done

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