\[3x-10=9\]
1
Add 1010 to both sides.
3x=9+103x=9+10

2
Simplify  9+109+10  to  1919.
3x=193x=19

3
Divide both sides by 33.
x=193x=\frac{19}{3}

Done

Decimal Form: 6.333333

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