12+7x-21=3x-9+4x

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Solution for 12+7x-21=3x-9+4x equation: 



12+7x-21=3x-9+4x

We move all terms to the left:

12+7x-21-(3x-9+4x)=0

We add all the numbers together, and all the variables

7x-(7x-9)+12-21=0

We add all the numbers together, and all the variables

7x-(7x-9)-9=0

We get rid of parentheses

7x-7x+9-9=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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