4x-21=2x-1

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Solution for 4x-21=2x-1 equation: 



4x-21=2x-1

We move all terms to the left:

4x-21-(2x-1)=0

We get rid of parentheses

4x-2x+1-21=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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