9x−4=99x-4=9
1
Add 44 to both sides.
9x=9+49x=9+4

2
Simplify  9+49+4  to  1313.
9x=139x=13

3
Divide both sides by 99.
x=139x=\frac{13}{9}

Done

Decimal Form: 1.444444

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