\[3x+1=7\]

1
Subtract 11 from both sides.
3x=713x=7-1

2
Simplify  717-1  to  66.
3x=63x=6

3
Divide both sides by 33.
x=63x=\frac{6}{3}

4
Simplify  63\frac{6}{3}  to  22.
x=2x=2

Done

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