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

4x-(7x-21)=0

We get rid of parentheses

4x-7x+21=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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