3x-7=21-4x

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Solution for 3x-7=21-4x equation: 



3x-7=21-4x

We move all terms to the left:

3x-7-(21-4x)=0

We add all the numbers together, and all the variables

3x-(-4x+21)-7=0

We get rid of parentheses

3x+4x-21-7=0

We add all the numbers together, and all the variables

7x-28=0

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

7x=28

x=28/7

x=4

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