4x-21=2x-13

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Solution for 4x-21=2x-13 equation: 



4x-21=2x-13

We move all terms to the left:

4x-21-(2x-13)=0

We get rid of parentheses

4x-2x+13-21=0

We add all the numbers together, and all the variables

2x-8=0

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

2x=8

x=8/2

x=4

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