4x+7=21+x

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Solution for 4x+7=21+x equation: 



4x+7=21+x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

4x-x-21+7=0

We add all the numbers together, and all the variables

3x-14=0

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

3x=14

x=14/3

x=4+2/3

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