3x-(x-7)=21

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



3x-(x-7)=21

We move all terms to the left:

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

We get rid of parentheses

3x-x+7-21=0

We add all the numbers together, and all the variables

2x-14=0

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

2x=14

x=14/2

x=7

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