3x-2(7-2x)=21

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Solution for 3x-2(7-2x)=21 equation: 



3x-2(7-2x)=21

We move all terms to the left:

3x-2(7-2x)-(21)=0

We add all the numbers together, and all the variables

3x-2(-2x+7)-21=0

We multiply parentheses

3x+4x-14-21=0

We add all the numbers together, and all the variables

7x-35=0

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

7x=35

x=35/7

x=5

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