9x=21+4x

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Solution for 9x=21+4x equation: 



9x=21+4x

We move all terms to the left:

9x-(21+4x)=0

We add all the numbers together, and all the variables

9x-(4x+21)=0

We get rid of parentheses

9x-4x-21=0

We add all the numbers together, and all the variables

5x-21=0

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

5x=21

x=21/5

x=4+1/5

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