8x9=78x-9=7

1
Add 99 to both sides.
8x=7+98x=7+9

2
Simplify  7+97+9  to  1616.
8x=168x=16

3
Divide both sides by 88.
x=168x=\frac{16}{8}

4
Simplify  168\frac{16}{8}  to  22.
x=2x=2

Done

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