12+3x=5x+21-3x

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Solution for 12+3x=5x+21-3x equation: 



12+3x=5x+21-3x

We move all terms to the left:

12+3x-(5x+21-3x)=0

We add all the numbers together, and all the variables

3x-(2x+21)+12=0

We get rid of parentheses

3x-2x-21+12=0

We add all the numbers together, and all the variables

x-9=0

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

x=9

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