4x-7=21.

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Solution for 4x-7=21. equation: 



4x-7=21.

We move all terms to the left:

4x-7-(21.)=0

We add all the numbers together, and all the variables

4x-7-21=0

We add all the numbers together, and all the variables

4x-28=0

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

4x=28

x=28/4

x=7

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