4+21=9+4x

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Solution for 4+21=9+4x equation: 



4+21=9+4x

We move all terms to the left:

4+21-(9+4x)=0

We add all the numbers together, and all the variables

-(4x+9)+4+21=0

We add all the numbers together, and all the variables

-(4x+9)+25=0

We get rid of parentheses

-4x-9+25=0

We add all the numbers together, and all the variables

-4x+16=0

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

-4x=-16

x=-16/-4

x=+4

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