3x-13=7+x

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Solution for 3x-13=7+x equation: 



3x-13=7+x

We move all terms to the left:

3x-13-(7+x)=0

We add all the numbers together, and all the variables

3x-(x+7)-13=0

We get rid of parentheses

3x-x-7-13=0

We add all the numbers together, and all the variables

2x-20=0

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

2x=20

x=20/2

x=10

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