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4x-2=x+20

We move all terms to the left:

4x-2-(x+20)=0

We get rid of parentheses

4x-x-20-2=0

We add all the numbers together, and all the variables

3x-22=0

We move all terms containing x to the left, all other terms to the right

3x=22

x=22/3

x=7+1/3

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