5x-(3x-x)=21

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Solution for 5x-(3x-x)=21 equation: 



5x-(3x-x)=21

We move all terms to the left:

5x-(3x-x)-(21)=0

We add all the numbers together, and all the variables

5x-(+2x)-21=0

We get rid of parentheses

5x-2x-21=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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