3+x=2x-20

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Solution for 3+x=2x-20 equation: 



3+x=2x-20

We move all terms to the left:

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

We get rid of parentheses

x-2x+20+3=0

We add all the numbers together, and all the variables

-1x+23=0

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

-x=-23

x=-23/-1

x=+23

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