\[3x-8=4\]

1
Add 88 to both sides.
3x=4+83x=4+8

2
Simplify  4+84+8  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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