10x9=410x-9=4

1
Add 99 to both sides.
10x=4+910x=4+9

2
Simplify  4+94+9  to  1313.
10x=1310x=13

3
Divide both sides by 1010.
x=1310x=\frac{13}{10}

Done

Decimal Form: 1.3

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