10x5=910x-5=9

1
Add 55 to both sides.
10x=9+510x=9+5

2
Simplify  9+59+5  to  1414.
10x=1410x=14

3
Divide both sides by 1010.
x=1410x=\frac{14}{10}

4
Simplify  1410\frac{14}{10}  to  75\frac{7}{5}.
x=75x=\frac{7}{5}

Done

Decimal Form: 1.4

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