9x10=109x-10=10

1
Add 1010 to both sides.
9x=10+109x=10+10

2
Simplify  10+1010+10  to  2020.
9x=209x=20

3
Divide both sides by 99.
x=209x=\frac{20}{9}

Done

Decimal Form: 2.222222

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