\[3x-7=5\]

1
Add 77 to both sides.
3x=5+73x=5+7

2
Simplify  5+75+7  to  1212.
3x=123x=12

3
Divide both sides by 33.
x=123x=\frac{12}{3}

4
Simplify  123\frac{12}{3}  to  44.
x=4x=4

Done

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