\[10x+1=9\]
1
Subtract 11 from both sides.
10x=9−110x=9-1

2
Simplify  9−19-1  to  88.
10x=810x=8

3
Divide both sides by 1010.
x=810x=\frac{8}{10}

4
Simplify  810\frac{8}{10}  to  45\frac{4}{5}.
x=45x=\frac{4}{5}

Done

Decimal Form: 0.8

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