\[3x-7=20\]
1
Add 77 to both sides.
3x=20+73x=20+7

2
Simplify  20+720+7  to  2727.
3x=273x=27

3
Divide both sides by 33.
x=273x=\frac{27}{3}

4
Simplify  273\frac{27}{3}  to  99.
x=9x=9

Done

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