\[2x-7=9\]

1
Add 77 to both sides.
2x=9+72x=9+7

2
Simplify  9+79+7  to  1616.
2x=162x=16

3
Divide both sides by 22.
x=162x=\frac{16}{2}

4
Simplify  162\frac{16}{2}  to  88.
x=8x=8

Done

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