\[4x-3=13\]

1
Add 33 to both sides.
4x=13+34x=13+3

2
Simplify  13+313+3  to  1616.
4x=164x=16

3
Divide both sides by 44.
x=164x=\frac{16}{4}

4
Simplify  164\frac{16}{4}  to  44.
x=4x=4

Done

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