7+3x=20+x

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Solution for 7+3x=20+x equation: 



7+3x=20+x

We move all terms to the left:

7+3x-(20+x)=0

We add all the numbers together, and all the variables

3x-(x+20)+7=0

We get rid of parentheses

3x-x-20+7=0

We add all the numbers together, and all the variables

2x-13=0

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

2x=13

x=13/2

x=6+1/2

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