5x-21-x=x-18

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Solution for 5x-21-x=x-18 equation: 



5x-21-x=x-18

We move all terms to the left:

5x-21-x-(x-18)=0

We add all the numbers together, and all the variables

4x-(x-18)-21=0

We get rid of parentheses

4x-x+18-21=0

We add all the numbers together, and all the variables

3x-3=0

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

3x=3

x=3/3

x=1

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