4x-21=7x=

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



4x-21=7x=

We move all terms to the left:

4x-21-(7x)=0

We add all the numbers together, and all the variables

-3x-21=0

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

-3x=21

x=21/-3

x=-7

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