\[2x-5=7\]

1
Add 55 to both sides.
2x=7+52x=7+5

2
Simplify  7+57+5  to  1212.
2x=122x=12

3
Divide both sides by 22.
x=122x=\frac{12}{2}

4
Simplify  122\frac{12}{2}  to  66.
x=6x=6

Done

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