4x-21=x-13

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Solution for 4x-21=x-13 equation: 



4x-21=x-13

We move all terms to the left:

4x-21-(x-13)=0

We get rid of parentheses

4x-x+13-21=0

We add all the numbers together, and all the variables

3x-8=0

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

3x=8

x=8/3

x=2+2/3

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