5x-9=12+4x

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Solution for 5x-9=12+4x equation: 



5x-9=12+4x

We move all terms to the left:

5x-9-(12+4x)=0

We add all the numbers together, and all the variables

5x-(4x+12)-9=0

We get rid of parentheses

5x-4x-12-9=0

We add all the numbers together, and all the variables

x-21=0

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

x=21

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