3x-(4-2x)=21

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Solution for 3x-(4-2x)=21 equation: 



3x-(4-2x)=21

We move all terms to the left:

3x-(4-2x)-(21)=0

We add all the numbers together, and all the variables

3x-(-2x+4)-21=0

We get rid of parentheses

3x+2x-4-21=0

We add all the numbers together, and all the variables

5x-25=0

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

5x=25

x=25/5

x=5

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